Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86d19dcdc05190d…

MALICIOUS

PDF

81.5 KB Created: 2021-03-01 14:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f923f633624e3bbe613574e4a58bcb1f SHA-1: bf4b07409987d74f7061938c35b0c3518ec7c7ed SHA-256: a86d19dcdc05190d2448a1b4c393781b64bd142605dd43182b9e4e80b4efe068
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one pointing to a suspicious domain ('zajinet.ru') that is likely part of a link farm designed for SEO manipulation. The heuristic 'SE_URGENCY_LURE' suggests the document content attempts to create a sense of urgency. ClamAV detection and ML classification confirm the malicious nature, indicating a phishing or trojanized document.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/wix?keyword=schenectady+saratoga+sharks+swim+club PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5fc6d52dbe923.pdfIn PDF document text
    • http://gigurokubi.66ghz.com/comparing_unlike_fractions_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5fe362b7426ad.pdfIn PDF document text
    • http://namunogetivij.iblogger.org/benshaw_mx2_quick_start_manual.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/11281313220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5fca01309cabf.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/what_is_indian_trust_act.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/panasonic_phones_customer_service.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/fKgcfgd/within_the_ruins_new_album.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_6025d13321e79.pdfIn PDF document text
    • http://douchehq.xyz/16880178540mvowt.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/mahindra_finance_car_loan_noc_formatz3qw2.pdfIn PDF document text
    • http://widokig.iblogger.org/12952809433.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/45689972441.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/gdsnLVI/depebujemelibavag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tekegaroj.epizy.com/romeo_and_juliet_act_one_scene_2_translation.pdfIn PDF document text
    • http://lumaradidufil.epizy.com/aadhar_address_update_form_online.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/18361012217.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 5736 bytes
SHA-256: 580e5079bcd854681312fd856e7c85574b66684dfef9eef288da13ac0a47b461
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 14212 bytes
SHA-256: abcbaa4381c7119dac3a748711b95ff45636539be383788611bf345eb24fdab4
font_02_sfnt_off0001285c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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