Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3f4c7a4fba9c9b…

MALICIOUS

PDF

74.3 KB Created: 2021-03-22 12:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0077cfc4ee03457c6360935d1cd5ff6e SHA-1: 458617a3ee3c0e28afc69b0c9adc493e55418a07 SHA-256: 6a3f4c7a4fba9c9be55644272253ab7d7d310b38487366e2e867f19d38cf829e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=tratamiento+absceso+hepatico+piogeno+pdf PDF link annotation
    • https://puxasune.weebly.com/uploads/1/3/1/3/131379014/99e6dd55f7.pdfIn PDF document text
    • https://napuguzexavuzes.weebly.com/uploads/1/3/4/8/134875267/patobigale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488315/normal_5ff267820eac3.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/vewelidaxor_kujekaf_wonunawe_nimelilaneros.pdfIn PDF document text
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/9343920.pdfIn PDF document text
    • https://zalekekowijix.weebly.com/uploads/1/3/5/3/135346798/d39cb402274.pdfIn PDF document text
    • https://kemiponoza.weebly.com/uploads/1/3/4/6/134605011/futor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_602743473462b.pdfIn PDF document text
    • https://zivuxava.weebly.com/uploads/1/3/5/9/135991205/kofup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_601f1fe970d0d.pdfIn PDF document text
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/51a12f937dacd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5fd1012974af8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_60534f3ece3fc.pdfIn PDF document text
    • https://tiwenevudadag.weebly.com/uploads/1/3/4/7/134715745/6285104.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/5921050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8f0f10-2147-4ce3-a7e0-7ff8af471276/survival_food_storage_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320f48cb-ab43-4c89-add1-ee1613ea4a42/my_favourite_things_lyrics_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83658a9-0fa2-404e-8125-1951962c3063/xinudomopular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1e8c62-bec5-41fb-8760-60b2cb1d01fa/21138422498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc3e450-d9ce-4b7a-8638-ca7a79ae6194/best_diaper_genie_for_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f6666c-6034-401f-939d-b33a251a849c/la_esposa_que_ora_dia_30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a90813-a8a3-497f-98cf-c444839fec21/97760313250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e0ce79-20a9-43ef-bcaa-9c799f371e1a/the_great_gatsby_chapter_2_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79636886-db66-41b5-be34-0f9515002cbe/five_nights_at_freddys_game_free_download_full_version_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b9cfec-dbce-47ac-a757-58fd31d1adf6/hamlet_act_4_scene_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78545a90-ef43-4d49-9700-03266f5c74f3/what_are_the_duties_and_responsibilities_of_a_lawyer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3ec70c-31ad-40a4-833b-9eef89511955/jolixatabafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f483c5d-4c76-42ab-ab0f-359829d425bb/65253012376.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 5624 bytes
SHA-256: 7383aa6c7643a5219ae1e318091bfc71fece804d54e3ff53452726f87e157df8
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 11464 bytes
SHA-256: e100338eb097e30c41b90e6ed3540baa48d08f821e27b202000dd32f2f5795e7

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