Malicious PDF — malware analysis report

Static analysis result for SHA-256 876b44bd446e307c…

MALICIOUS

PDF

83.4 KB Created: 2021-06-10 00:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d773f116b1df8ba43c915143aae26cfc SHA-1: b127ee40c9add9c3231f84f7387609cd9e485584 SHA-256: 876b44bd446e307ce57ca88f5b2014f97d1e36524f3d4affd2f13bbe66b25deb
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://irlanc.ru/pbw?utm_term=decepticon+names+and+pictures PDF link annotation
    • https://nokuzase.weebly.com/uploads/1/3/4/7/134765685/7681634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_600cc59e8a2ba.pdfIn PDF document text
    • https://rojogude.weebly.com/uploads/1/3/4/3/134396813/xarakosolafabiwasoru.pdfIn PDF document text
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/bezipat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_60648003ed3e2.pdfIn PDF document text
    • https://wojipinokogax.weebly.com/uploads/1/3/4/8/134863097/kuruge-malinonakiridil-nirasikope.pdfIn PDF document text
    • https://lojexidipiwakif.weebly.com/uploads/1/3/4/0/134041559/1cdcf3f.pdfIn PDF document text
    • https://jopidebo.weebly.com/uploads/1/3/4/6/134608850/soditalilazaxamura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448984/normal_604662011c088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_602cb2503e30d.pdfIn PDF document text
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/wuxedarejafemotudef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gexufak.pbworks.com/w/file/fetch/144550962/download_factory_inc_mod_apk_unlimited_money_and_gems.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144615744/nalonuvivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad46e7f-2ba5-4703-ba81-d4aabba581ed/which_of_the_three_branches_of_the_u.s_government_is_the_most_powerful.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/w/file/fetch/144677958/the_installation_failed_in_the_safe_os_phase_apply_image.pdfIn PDF document text
    • http://fuzobonesujo.pbworks.com/f/67827821065.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/f/47328864248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa647236-ff49-4536-a3fe-8e3ab8465272/vadafagopubosaxakevapex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d657a01-3042-4cec-97e3-84eb9e4979ec/dont_look_back_2009_full_movie_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11cd270-25fe-46c6-99df-090b13d1fe17/robimubilodigozomasov.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/why_hitachi_ac_red_light_blinking.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_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 5184 bytes
SHA-256: a670c98fc7ef775c775ddbda5211fb88660d53b072f2a926e5a06e7b90de77ce
font_01_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 10832 bytes
SHA-256: 9378e66a545105a1ceb38fa7e7f69d9dacf1231c0d8936f55d05af52458d84f7

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