Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d844d6c7a9b748b…

MALICIOUS

PDF

89.0 KB Created: 2021-04-25 03:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a8a6c8504243885c00df0b696d867429 SHA-1: 257fb8e8dd51372a44c4ed80bd3101f92375c3b1 SHA-256: 7d844d6c7a9b748bb3f66ec71a28d2c941a9ab0f2cfc7c43e2b0084a704a2543
216 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in phishing or to download further malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and 'SE_CALLBACK_LURE' suggests a phishing or scam pretext. ClamAV detection confirms the malicious nature, identifying it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the structure and link farm suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://seumenha.ru/strik?utm_term=washington+dc+covid+testing+walgreens PDF link annotation
    • https://cdn.sqhk.co/dibirolinu/btku6L8/the_intelligent_investor_file_free_download.pdfIn PDF document text
    • http://my-credit.info/93464092128b1qfu.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/jdKJshg/best_hashtags_for_instagram_followers_in_pakistan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5fe6944b3ff8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451766/normal_6048c3f21ce60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_60602b690e729.pdfIn PDF document text
    • https://cdn.sqhk.co/dipasupor/jhs3gc0/bawazonasanuwafibenovimas.pdfIn PDF document text
    • https://mazifufozabi.weebly.com/uploads/1/3/4/6/134690202/e418e75e1495b8.pdfIn PDF document text
    • http://construt.site/736544941979f5kg.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/iCAgijb/cnc_simulator_free_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/jhgegf7/nugaxaxikemexemigomunogow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_601b7e2c4a93e.pdfIn PDF document text
    • https://cdn.sqhk.co/zajagatetode/mLNrOje/sudinadidosuvotetanup.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/kufatupudufi-muloz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/cavernous_venous_malformation_orbit_radiology.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/why_do_hedge_funds_not_beat_the_market.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/vujatoma.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/google_drive_link_wget.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_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 5368 bytes
SHA-256: 6f8f106478ce0ba023819701a10bca38f4b6bc9719e05a1c78f82439dbe9964a
font_01_sfnt_off00012f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7B 11928 bytes
SHA-256: 3806b6b51578e64cafb14478ed5c1f71caa0b44f4808e89a00b705d1721840a1

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