Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39cf61303b263e4…

MALICIOUS

PDF

34.7 KB Created: 2020-06-17 08:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 79109a862bbf4a24ae9c5fcec8d9268d SHA-1: 754314d646b3c41621cf8e41fc62f42477e85e0f SHA-256: a39cf61303b263e485de6ddccd88b48eea853fa743e55b1d42eb6138db1f082b
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.001 PowerShell

The PDF contains embedded JavaScript and a large number of external links, indicating a likely SEO poisoning or link farm attack. The primary heuristic identified a mass of external PDF links, suggesting the document's purpose is to redirect users to a network of other PDF files hosted on compromised or attacker-controlled domains. No specific script functionality was detailed, but the overall pattern points to a content-distribution or redirection scheme.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://confidance.eu/uploads/1/3/1/6/131606331/131606331.html#2nd+grade+holiday+worksheets PDF link annotation
    • http://webmail.losangelesworkingdogs.com/uploads/1/3/0/6/130603749/nixiwosaxidobivu.pdfIn PDF document text
    • http://bumpkinfoodhub.com/uploads/1/3/0/9/130969053/668782d5e5ea3e0.pdfIn PDF document text
    • http://hostmaster.premierprescotthomes.com/uploads/1/3/0/5/130551654/344d5247d5b2fa.pdfIn PDF document text
    • http://2vv.undesirable.us/uploads/1/3/0/7/130776026/latilekuvusamogikob.pdfIn PDF document text
    • http://tac-performance.com/uploads/1/3/2/3/132303156/3e1d40f193c3.pdfIn PDF document text
    • http://whm.alisonrooke.com/uploads/1/3/0/7/130775009/988ea9c2.pdfIn PDF document text
    • http://dmcneilpercussion.com/uploads/1/3/0/3/130323157/82a14.pdfIn PDF document text
    • http://matrixcarpetbinder.com/uploads/1/3/0/6/130621307/duselekosetisab_wajewodo_gezewotapute_pugixitiw.pdfIn PDF document text
    • http://mail.confidance.com/uploads/1/3/0/4/130488338/40cb306cc2.pdfIn PDF document text
    • http://channelcars.co.uk/uploads/1/3/0/7/130739090/rudikusitut.pdfIn PDF document text
    • http://rimasrl.facile.hosting/uploads/1/3/0/4/130492038/2679364.pdfIn PDF document text
    • http://sammyjean.net/uploads/1/3/0/3/130313359/2392122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D74 5172 bytes
SHA-256: 237b263ea2c004065e7481cc2409c5f4cc816279657398706f4ad3a947300b9c
font_01_sfnt_off00005f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F01 9352 bytes
SHA-256: 57210d6f711c6dd913a43ca7592705c1220774058004b231898f8ae137184c5e

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