Malicious PDF — malware analysis report

Static analysis result for SHA-256 d757f45fb75cd81b…

MALICIOUS

PDF

78.2 KB Created: 2021-03-22 15:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69aa8bdefde960f8b9c2a83d7278af64 SHA-1: ba76d6ac9cbc866e22efbe2e0f5cb8022dcfe008 SHA-256: d757f45fb75cd81bc2c6202b2cc5a3dd61907178a9a42cdd22358328c76d3f48
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. The document body contains a search query, and numerous external URLs are embedded, suggesting a tactic to drive traffic to malicious or spam sites. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or SEO spam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=where+can+i+get+a+cortisone+shot+for+acne
    • http://serdyukov.pro/zoxomfzjnd.pdf
    • http://swiss-gear.store/sixobidazutatasfttx.pdf
    • https://kuzosilu.weebly.com/uploads/1/3/2/8/132815793/4189678.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/5ac995584f.pdf
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/4866917.pdf
    • http://ita-women.space/76911209316bqseq.pdf
    • http://leledup.mypressonline.com/kopajumasamebenedejiwax.pdf
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/bewajilogami.pdf
    • http://rijoginijamibeg.mypressonline.com/mexuwukabuz.pdf
    • http://firstreadersclub.com/174475331211uh4.pdf
    • http://manibupefif.mypressonline.com/vamitalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bumejefivoxigo.myartsonline.com/modos_de_produccion_economia.pdf
    • http://pikubub.onlinewebshop.net/45502003539.pdf
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_306f9083788c4d83b7606b00afdccc01.pdf?index=true
    • http://geforagegi.atwebpages.com/xozadavusisiso.pdf
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_7eed839b7f3547e299906d320f735084.pdf?index=true
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_051d506b47f54c63a81d2fdd04d2020e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e433.bin
05574cef53adf2464039f3efa7cc9a8129d46bf5ed1625d31a9f397f8c5a85dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 4912 bytes
font_01_sfnt_off0000f4e0.bin
10e50897b937177dd614690efeb5537d704e3dae74c136e53a4fde47dd708b39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 11448 bytes
font_02_sfnt_off00011bac.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 4324 bytes

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