Malicious PDF — malware analysis report

Static analysis result for SHA-256 4771c57b275c2e6e…

MALICIOUS

PDF

35.9 KB Created: 2020-04-06 04:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: d795dbebf63d2f71bc0e6f5e6a675054 SHA-1: d5a6d853db7fe7759c3a1c159de46ade2a00ca1a SHA-256: 4771c57b275c2e6e4913cbda79f3ba7dd07cdf7fd99b30c35e4ebffc0937acce
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are dynamically generated and point to domains commonly used for SEO spam or phishing. The document body also contains a fake phone number and urgency lures, consistent with a callback phishing or tech-support scam. The primary attack pattern involves directing users to malicious external URLs, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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 http://lifteens.com/uploads/1/3/0/5/130590391/130590391.html#ashley+stewart+corporate+phone+number PDF link annotation
    • http://fionabooth.net/uploads/1/3/0/6/130639807/bixuba-tivuvujititet-kanuvilanopos-gilumidene.pdfIn PDF document text
    • http://knivesfromlittlebearlane.com/uploads/1/3/1/4/131436966/b8c08d211.pdfIn PDF document text
    • http://jrscallops.com/uploads/1/3/0/7/130775271/nopasudevekesapema.pdfIn PDF document text
    • http://sosdesentupidora.net/uploads/1/3/0/6/130604903/d63d40a593.pdfIn PDF document text
    • http://jessicafinancedit.com/uploads/1/3/0/8/130874244/c1442bf168.pdfIn PDF document text
    • http://reddenbros.net/uploads/1/3/0/6/130621800/kalenexumuwapararaj.pdfIn PDF document text
    • http://sksmun.org/uploads/1/3/0/7/130775166/pomamekuxa.pdfIn PDF document text
    • http://ceikoet.com/uploads/1/3/0/6/130621094/649de.pdfIn PDF document text
    • http://benzunhinged.net/uploads/1/3/1/4/131410545/dusewujoxosi_fagikatobalifop_vupamixixujon_diwirig.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DC 8380 bytes
SHA-256: 5cada2091c2cb8e16ed30baba439e0b5b2b0cee21ac692513c2690386a6e5d77

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