Malicious PDF — malware analysis report

Static analysis result for SHA-256 6159b5a90abfc062…

MALICIOUS

PDF

37.0 KB Created: 2020-03-11 14:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-08
MD5: 35efcf007f0fd32f5128e69b7135f868 SHA-1: ba2498717916ebc3968905522c079f01aaee3c29 SHA-256: 6159b5a90abfc062bde5b4dbc4bc3813d4d5c0b94c6d509c28b643ab1caf3b7c
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains embedded URLs that are likely part of a link farm or SEO manipulation scheme, potentially leading to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://cpanel.justanothersunday.com/uploads/1/3/1/0/131070645/131070645.html#adjectival+adverbial+prepositional+phrases PDF link annotation
    • http://bungareelabradoodlepups.com/uploads/1/3/0/6/130621158/34fa82394a06.pdfIn PDF document text
    • http://worldfamouslasagna.com/uploads/1/3/0/7/130775186/427740.pdfIn PDF document text
    • http://my-reconciliation.com/uploads/1/3/0/6/130640104/9141724.pdfIn PDF document text
    • http://rkfest.com/uploads/1/3/0/6/130621201/fokufevujixoz.pdfIn PDF document text
    • http://9500bradford.com/uploads/1/3/0/2/130289542/3604232.pdfIn PDF document text
    • http://shopflowerphotos.com/uploads/1/3/0/7/130776483/fubarezate-vuzawuwu-zedogod.pdfIn PDF document text
    • http://mail.com-unlocked-valid-account.com/uploads/1/3/0/4/130435978/f9a42db.pdfIn PDF document text
    • http://pegasusphotobooth.com/uploads/1/3/0/6/130603698/5654128.pdfIn PDF document text
    • http://callowbird.com/uploads/1/3/0/3/130323163/dopupizuridavux.pdfIn PDF document text
    • http://needlefreeconnector.com/uploads/1/3/0/6/130605237/6654270.pdfIn PDF document text
    • http://hostmaster.hostmaster.eastcoastbagel.com/uploads/1/3/0/4/130483956/9df63.pdfIn PDF document text
    • http://braxtonbrooks.com/uploads/1/3/0/5/130539354/2627549.pdfIn PDF document text
    • http://hoy.bz/uploads/1/3/0/5/130545537/1066883.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000691f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691F 7600 bytes
SHA-256: 6c9dfc64fa7f939e86ee4deefe38ca8892517d05f1e71ca09dd2737a00eda114

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