Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a98dc817c71758…

MALICIOUS

PDF

29.8 KB Created: 2020-06-07 11:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 5b2626d81cb529a98d08dad4c3722f01 SHA-1: f5c2fa5d9da9112655aa5980901f2528ed38c3d1 SHA-256: c5a98dc817c7175815399a18268a0f324f6ca4171e7d18d63b1645849df2d64a
96 Risk Score

Malware Insights

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

The PDF file contains a link farm of 28 external PDF links, many of which point to domains that appear to be compromised or used for hosting malicious content. The primary heuristic firing indicates a 'PDF_SEO_LINK_FARM' which suggests a tactic to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, contains references to URLs that are part of this link farm, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://sanvalentintufiambreria.com/uploads/1/3/0/3/130313221/130313221.html#delta+scroll+saw+parts PDF link annotation
    • http://myportfoliofits.com/uploads/1/3/0/6/130604905/7235920.pdfIn PDF document text
    • http://hequipsupply.com/uploads/1/3/0/7/130775393/bateso.pdfIn PDF document text
    • http://pilateseducationnetwork.com/uploads/1/3/0/4/130488371/ec5356fbef39f0.pdfIn PDF document text
    • http://hostmaster.rabbitresidence.org.uk/uploads/1/3/1/6/131636689/8213848.pdfIn PDF document text
    • http://pugetsoundoutcasts.com/uploads/1/3/1/4/131437779/sudizu-javipujakafovov.pdfIn PDF document text
    • http://cpanel.jamattice.com/uploads/1/3/0/5/130551487/dibilofozubodudazava.pdfIn PDF document text
    • http://admin.clumsycourierwine.com/uploads/1/3/1/4/131438111/mufupalagigumu-wobolutofereme-bapovopukux.pdfIn PDF document text
    • http://mail.pancreaticalliance.org/uploads/1/3/1/1/131164168/4126289.pdfIn PDF document text
    • http://dnaelectrical.info/uploads/1/3/1/8/131856358/tefitoxikexet.pdfIn PDF document text
    • http://tjmtllc.com/uploads/1/3/0/5/130551064/gebudalixumubo.pdfIn PDF document text
    • http://deficaredataface.com/uploads/1/3/0/3/130313729/juburedino_lunejunapaseman_domufixixo_lezexebod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ragogudulamu.files.wordpress.com/2020/06/74797431616.pdfIn PDF document text
    • https://jusimupap675060916.files.wordpress.com/2020/06/delurawefumulepavefup.pdfIn PDF document text
    • https://xulugotar.files.wordpress.com/2020/06/varesejezokedatulepadapar.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

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_off00004903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4903 10052 bytes
SHA-256: 0cb774ad9741d790def75bedd58aa6f048d42769fdc58f25b914c90aa2b1b3c0

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