Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a0d5090e219a68…

MALICIOUS

PDF

83.0 KB Created: 2021-03-01 04:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4e81789218dbd3baf95e59065d1fa0d7 SHA-1: 74ca69948ab42432dbbf8650a8d1ec8add30c58d SHA-256: 16a0d5090e219a68e5b6c120bd00bcd23d207ab0057a378a9f5d53b1e36ca925
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm and potential phishing lure, as indicated by multiple heuristics including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The embedded URLs point to domains that are likely disposable, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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/123?utm_term=what+can+i+study+at+unisa+with+higher+certificate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387226/normal_6026788733b84.pdfIn PDF document text
    • http://topidanom.22web.org/nafejujapisabojiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_602b7bdf32ae0.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/hie5cjg/war_robots_download_pc_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/aZhbii0/pounds_to_nz_dollars_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/f0ij8ZK/voice_recorder_on_iphone.pdfIn PDF document text
    • http://fofakowusagafo.22web.org/terapia_cognitivo_conductual_ansiedad_en_nios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426543/normal_60045073a6724.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/hhijAjg/dragon_goddess_d_d.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/daxukevegazenewoboxexotef.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/479c326e.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/sorokib.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/tepukoxaminiziz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigozapovi.epizy.com/allegiant_book_online.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/the_standard_insurance_phone_number.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/97769346773.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_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 5460 bytes
SHA-256: db28598e2bc77812c652914c05fcd9ca95171b698d4f4d82ab29eafce15652b2
font_01_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 11236 bytes
SHA-256: b91fce32afcdeb726122f379eb7ee0e158c4905098f3683b84a40963e73a163a

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