Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff922f2e5ec8884…

MALICIOUS

PDF

66.8 KB Created: 2021-05-25 10:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dcf5ce0a8ca3a3a82a46f69bec979d36 SHA-1: 794e2d815d229114cef36838587835c96b5c49a0 SHA-256: 7ff922f2e5ec88847ef0a37c11d6002193fba4a407cd89b687b9649c5fa65f8b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing/trojan PDF. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=unit+periodic+trends+test+review+answer+key PDF link annotation
    • https://bekonerotukabi.weebly.com/uploads/1/3/4/3/134366377/5186721.pdfIn PDF document text
    • https://vifomamup.weebly.com/uploads/1/3/1/1/131163898/6d39b8f6182a1d.pdfIn PDF document text
    • https://mezulawa.weebly.com/uploads/1/3/4/5/134597648/3373089.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/pixudupifozaf.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/7897015.pdfIn PDF document text
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/patener.pdfIn PDF document text
    • https://nuramovu.weebly.com/uploads/1/3/4/3/134363108/fijib_vuxixisasewuba_nobalifuravosi_segijuriwus.pdfIn PDF document text
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/supuwad_fixebi_jugunelesomima.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/3649207.pdfIn PDF document text
    • https://segagewemavovus.weebly.com/uploads/1/3/0/8/130874565/subaduzutikojurunaf.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/81db410e-fd81-43d1-b5a1-286acd611c6d/kisuwewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce9fc00-7df0-4294-b2cd-c618e1ae351e/we_can_remember_it_for_you_wholesale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3454c35d-c409-472e-97a6-4189070d2419/lididoxukiputiruvugozifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4c4d36-e8a0-4e3f-b45b-021baba10783/the_vegetarian_flavor_bible_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d920aa-fce0-4c36-839b-8fc728bea786/zulab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ec38f0-7b29-4518-8397-8c9be5c0e993/gobumoxusegediwaranax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84dcab03-616b-498d-8779-71ea56f31754/dark_souls_3_str_dex_faith_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6761cbca-2c21-4b55-881d-2f34bf43388e/will_hydrogen_peroxide_cure_athletes_foot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169444c2-9adc-45a1-8cee-b3fedc4effac/hoover_windtunnel_canister_vacuum_filters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9508c2-8b28-4261-8eb1-5289062e2ed1/how_to_unlock_i-pilot_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b43119f-65f6-48ae-902d-951b62d27edc/download_sub4sub_pro_for_youtube_mod_apk.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_off0000c64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64D 5344 bytes
SHA-256: 06f4120a7f4285411f7be29ac4596bdf2081d37129a6aa5f3cb63befd27e165c
font_01_sfnt_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 10404 bytes
SHA-256: ed124ef2b77d266091320068182727b47c10e77fb7fe4b3fe963a0cd4c18f280