Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77f71610d01c239…

MALICIOUS

PDF

78.5 KB Created: 2021-03-03 03:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 08388004cf2536e0badb87a737ebe094 SHA-1: c550c8e7cfa194ac94610a1b769d6ad108d56912 SHA-256: d77f71610d01c239345c387700739d3f4e6ab9f8c21cd4ff33737052d85fd6ee
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to online tests and urgency, aligning with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xajibur.ru/strik?utm_term=i+want+to+take+my+ged+test+online+for+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387052/normal_5fc644c80f049.pdfIn PDF document text
    • https://xufaxasevejanog.weebly.com/uploads/1/3/4/8/134886042/judovuxamexazo-bizevagilili-gusulagejotu.pdfIn PDF document text
    • http://org-fruit.space/64916785726vq8vi.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/ershemF/40990239890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_602ea7b13fb41.pdfIn PDF document text
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/vojedumage_ruretoku_vosarazetome.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/7nc5nOK/auto_reply_text_to_specific_numbers_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/qgdhhhS/86367455256.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/gjDj5je/rifabagaxin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5fc6783d4d832.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/hchhAhR/run_zombie_run_review.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/new_yorker_caption_contest_740.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/honeywell_rth230b_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/lemijexo/ihhfjgt/game_of_thrones_swords_names_and_owners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 5420 bytes
SHA-256: 31427a401f5b9577da4a77d9bf7cd09846d789b0e317f16cea06841e60b97f26
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 10236 bytes
SHA-256: f3529700f7cf0bc7c2daba491a689ef5fe47081dc0980182a3b2268723ab54d4

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