Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ae8fee4eb4f25c…

MALICIOUS

PDF

67.9 KB Created: 2021-02-17 23:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ef9d43aa1611a19f393b43b7ef187156 SHA-1: 270059071ad52dd38e5e6b485168e3f226d826a8 SHA-256: d7ae8fee4eb4f25c3777af3bf4a1fd939472a1720a9799767f031df19db02aba
146 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and heuristic firings indicate it is a link farm and a callback phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a social engineering attack.

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.
  • 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://bologen.ru/strik?utm_term=stihl+bg55+primer+bulb PDF link annotation
    • http://xsale.trade/fozurofutegelw5ped.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462056/normal_5fee868d9d6b6.pdfIn PDF document text
    • https://rofajubufilotol.weebly.com/uploads/1/3/1/3/131384128/vuvidotejabumelaj.pdfIn PDF document text
    • http://sell-toclick.online/59950786985l6ty7.pdfIn PDF document text
    • https://fuvetowonilup.weebly.com/uploads/1/3/1/3/131383456/6361c0b6.pdfIn PDF document text
    • http://puxeguka.iblogger.org/provisional_admission_letter_format.pdfIn PDF document text
    • http://yesnutural.space/236314293144trm2.pdfIn PDF document text
    • http://vipadminler.org/turimekhxk0.pdfIn PDF document text
    • http://streamsweets.com/busofugexoloferuxinhtjae.pdfIn PDF document text
    • https://sijokazodile.weebly.com/uploads/1/3/1/4/131454207/7562476.pdfIn PDF document text
    • https://jajonugofetafis.weebly.com/uploads/1/3/0/7/130776034/romibadenuzo_podotidorulef_zejukumovozo_dalalilawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5fc56ba796d40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478947/normal_5fecc526ef748.pdfIn PDF document text
    • https://memefuzagimo.weebly.com/uploads/1/3/4/6/134612336/eb74beeef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujosivetobifir.epizy.com/il_canzoniere_della_morte.pdfIn PDF document text
    • http://korimuf.epizy.com/64037217980.pdfIn PDF document text
    • http://peregal.epizy.com/identifying_author_s_perspective_worksheets.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_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 5212 bytes
SHA-256: 8994d868f6e15c4353cc802e470da00be35cedab5723f7230d9d2f07c23887cd
font_01_sfnt_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 11276 bytes
SHA-256: 5ab1c3a9475a1f627d4a25151fa73d4bd6f5421191e2aa083b95406f109f7442

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