Malicious PDF — malware analysis report

Static analysis result for SHA-256 825a62478973627f…

MALICIOUS

PDF

86.3 KB Created: 2021-04-09 03:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c68e01acb21fcb1f83b4d423094ba179 SHA-1: e8bbc046db7ac70b8c2e58c2497ee912ef1377a7 SHA-256: 825a62478973627f3a6fdd38aab279b474c5bc8af38f897b9f8a0ee32d678ba3
206 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a ClamAV signature, indicating it's a phishing or trojan delivery mechanism. The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://soxebez.ru/strik?utm_term=what+to+do+when+your+portable+charger+stops+working PDF link annotation
    • https://xaredoluvowa.weebly.com/uploads/1/3/1/8/131871785/48812f8a8.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/cisco_rv130_vpn_setup_wizardgupsf.pdfIn PDF document text
    • https://zadujogor.weebly.com/uploads/1/3/1/4/131406982/06487688a52b061.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://zenisitidijo.weebly.com/uploads/1/3/4/3/134309999/5658123.pdfIn PDF document text
    • http://motivawka.online/fukutadipukamudobigegabimef1s.pdfIn PDF document text
    • http://premiumpornclips.com/bakewukuvaxy590.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/8443937.pdfIn PDF document text
    • http://cheatyou.site/99897567178bgucg.pdfIn PDF document text
    • http://unosital.space/4934837781248na.pdfIn PDF document text
    • http://impergamon.com/sims_3_store_content_free_reddits74x1.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/31b281.pdfIn PDF document text
    • http://cadenalia.com/wuburamadazavirevebixusx961j.pdfIn PDF document text
    • https://muxorapud.weebly.com/uploads/1/3/4/4/134455491/gajumajefizazer_fasapapugoju_lisodim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fca417-e419-4006-aab9-1c1de651c45c/58818252217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30a2bf3-e15f-4c2b-90b9-7aa7210df8d6/does_leaf_lettuce_have_calories.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_1b16713ffb544385a9cc4335cbc5d70b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/159707a1-5d54-47bc-bcf9-a8c6a9910079/33658313450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fc3bd7-08b3-4a8c-a455-64d1c2e908b3/9681804605.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_4bf65496a9fb4feca51858539eeb9cca.pdf?index=trueIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_879270be73b941d889e63df1f71ceed8.pdf?index=trueIn 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_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 5744 bytes
SHA-256: e2075784ab99fc5d53769206d63b9162b26edf20900dcc588a4a8e5ba5494a9a
font_01_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 11324 bytes
SHA-256: 9151667b06c23d1adc46379ead2b6e471bb8c567649ec94ce374e98642a71f6a