Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12131c433c08c81…

MALICIOUS

PDF

76.5 KB Created: 2021-02-19 09:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 83f3a5048f1cfce8d9357c63be0150e3 SHA-1: 160790b5e31e5b4682276d0f69441b96327e3914 SHA-256: e12131c433c08c81055b656d1ec9933cbf68a30b91be67204dc93fb524c05e84
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful websites.

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://baarspo.ru/wix?keyword=helicopter+game+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426815/normal_5fda24d08f026.pdfIn PDF document text
    • http://itclick.info/form_1120x_nol_carryback61msb.pdfIn PDF document text
    • http://nuveclovet.xyz/caracteristicas_de_la_figura_literaria_personificacionx44qa.pdfIn PDF document text
    • https://tiwuvaxitunux.weebly.com/uploads/1/3/0/8/130874175/1dd727c.pdfIn PDF document text
    • https://gumarifubora.weebly.com/uploads/1/3/4/4/134465571/6293607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504922/normal_5fe6a7c2a3c26.pdfIn PDF document text
    • https://felilediwifagid.weebly.com/uploads/1/3/1/4/131453780/gazoge-rovut.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/5010280.pdfIn PDF document text
    • http://gifozuxozud.22web.org/34349876954.pdfIn PDF document text
    • https://niwurepezexeted.weebly.com/uploads/1/3/5/3/135312419/siligigaw-ferikapet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_600aef3e7fed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_60299e7ac2457.pdfIn PDF document text
    • http://todayit.pro/make_lemonade_by_virginia_euwer_wolffgnylu.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/wokederuseov6nh.pdfIn PDF document text
    • http://megantv.site/mxq_pro_4k_android_tv_box_manualz1r3h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baguselewaz.epizy.com/49019404243.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 5380 bytes
SHA-256: 232439c8c52b49d2b8e45812aa4a9bbd02540907f97d332004c6075199b67e3e
font_02_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 10600 bytes
SHA-256: ff3a363c34599af2f4fc787a9895353d1b0b67ce0d72349c2b841b8affc6253d

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