Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbb70f070c14893…

MALICIOUS

PDF

77.5 KB Created: 2021-03-03 12:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 88597093ce6c3a67b2605ad5ec2b4f8e SHA-1: 68c95a31f9df158a464abde77c58c59d344d6124 SHA-256: 3fbb70f070c14893ea180664ec33ce1fc3ade79d3f594a74713b421b0e989d73
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially malicious websites, likely as part of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://gimoguvi.ru/wix?keyword=tanawha+trail+alltrails PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445118/normal_601670c21bdc5.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/manual_belson_stl_5708h9lp7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450417/normal_602687e20adde.pdfIn PDF document text
    • http://powerpoint4you.ru/19542813239micwr.pdfIn PDF document text
    • http://detonic-deutschland.website/does_samsung_tablet_have_a_flashlightab3pf.pdfIn PDF document text
    • http://letxxnx.org/100390722058lokl.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/Thijfjc/no_crop_pic_for_instagram_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485810/normal_5feece1bd39b2.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/ghdUjfq/widedam.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/aLhhkgh/disney_alien_claw_machine_arcade_game.pdfIn PDF document text
    • http://mandarin-fruit.space/bharatanatyam_instrumental_musicctspy.pdfIn PDF document text
    • http://wdd13.ru/canada._ca_ei_internet_reporting_loginqixod.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/MidQSHb/loteretawibinezevirujix.pdfIn PDF document text
    • http://rankingcoach-apps.com/dudivzex6e.pdfIn PDF document text
    • http://termometr-medikal.site/49332099837bdctj.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/pulujolatepuv/kufopuganagezulexutotatap.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/jason_bourne_full_movie_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/bfa_alchemy_level_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_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 4816 bytes
SHA-256: 808bfe6ca96cd9306c77e88446bfa3e19cd4d024e0535eefe69b0e515734026b
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 10680 bytes
SHA-256: 19ef50a166f06c763a48e0c6210ef0c1314c7ae46312a7434a1c3ebee1b76e34

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