Malicious PDF — malware analysis report

Static analysis result for SHA-256 e971ae82e8289ecd…

MALICIOUS

PDF

75.5 KB Created: 2021-03-10 05:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 927a31550a7c3d01ec6f53c44599b072 SHA-1: 9bd97cbff0b968e100bbc44e341bf99911aa39a4 SHA-256: e971ae82e8289ecd392b474d6b3d53f3f6640827d37c0328c62029906c351a73
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a suspicious URL on 'golowaki.ru', suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

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 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.
  • 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://golowaki.ru/award?keyword=cazadores+de+hadas+2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421468/normal_6046d475ac547.pdfIn PDF document text
    • http://mosquito.codes/best_coast_album_zips69y3.pdfIn PDF document text
    • http://hotel-engels.ru/t-_mobile_customer_service_phone_numberslhu0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_60378021c2054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412183/normal_5fc60da977655.pdfIn PDF document text
    • http://marketitaly.info/lutefagowuxisevy5jyl.pdfIn PDF document text
    • http://keysecret.ru/gerejaxagem2eic1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5feda18e94ae0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408991/normal_5fdd5d0f1a0ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/towakog/can_you_wirelessly_charge_a_galaxy_s10.pdfIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_361adfc441134a309d9295b7ca598ee3.pdf?index=trueIn PDF document text
    • https://b760d8db-9746-4821-aa2b-94c9f806d328.filesusr.com/ugd/26ce45_8e5fd41549624e3c925cf690f5254329.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejados/94719537796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d01b7e3-9b8d-46ce-a392-bb3fd7879f37/ruzepip.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/nickel_cadmium_battery_advantages_and_disadvantages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852098cc-3e64-409e-b75a-94405e6726f4/nec_dterm_80_phone_feature_button_flashing.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/78783006228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6bddf1-10fa-4e98-9066-1e01bdbc8337/berserk_manga_new_chapter.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/milpds_how_to_guide.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_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 5184 bytes
SHA-256: 207c11dd6b299c30f29505074ec9d6867600fc8c8d25e8a0dbd1d415cb5db188
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 11972 bytes
SHA-256: a8dbae9f803995d52b6efba0cea1659585c591589c142ccaa01f1fad326cfc43

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