Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bc55cbb88e6184…

MALICIOUS

PDF

78.2 KB Created: 2021-03-05 03:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee3686b949ee8e78b61456d693c3489d SHA-1: 2eb92ce1de479fe6c6a5f26e374cc218a0140d6b SHA-256: a7bc55cbb88e6184d015b5b7ea06784e216b6f7ffa0f22167150d1a7b5214414
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/123?utm_term=intro+to+biopsychology PDF link annotation
    • http://gexopidikimo.mygamesonline.org/high_fodmap_foods_to_avoid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489615/normal_6001603345538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5fdc4a8c7c753.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/ribejezixuvatamaludovori.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/hp_officejet_7110_user_manual.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/1597c.pdfIn PDF document text
    • https://wididalinur.weebly.com/uploads/1/3/3/9/133986726/bevadefusif-jisubej-tarovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_6018e3e14446f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_36a12ecee6bd4dfb92030036bca83495.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39000f39-be4f-4e3e-a7cb-2d21a471afa8/tudojezun.pdfIn PDF document text
    • http://xikusaduxofi.atwebpages.com/french_to_english_dictionary_buy_online_google.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/zixejusobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a935bf3c-cd4b-459a-becb-5a3961bc4633/jusesimasuzaz.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_a6cea32e1d0b47babeb9bc9fd95d2dc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b49ed81-2239-4b3d-bb88-d43dbc22c6f1/what_are_the_symptoms_of_lavender_town_syndrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65326031-7fe0-4315-8cf2-6068097de531/love_story_lyrics_video_song_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/witobowifides.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_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 5164 bytes
SHA-256: 569d099bf6f13887788a7120936a98c2f7b1d6b7e7596db4d22c5b0a4c935321
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 11108 bytes
SHA-256: ab23d3cbc0a53f3fcc12d43ecca1c7bf5ed9de8752ca91223eb6eafc674daeaf

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