Malicious PDF — malware analysis report

Static analysis result for SHA-256 6318a2ca43377478…

MALICIOUS

PDF

37.4 KB Created: 2020-05-15 17:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38e534ea983bc545785826e129e3f9b3 SHA-1: fee43a95022fb714a0515ba7b512968f2e7c6ef2 SHA-256: 6318a2ca43377478f83c2001ac2e88394b7940df7f8ff0f962a63db788bfdbb4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The embedded document body text, though partially corrupted, includes a URL that is also present in the list of extracted URLs. This suggests the primary function of this PDF is to redirect users to a network of other PDF files, potentially for SEO spam or to host malicious payloads.

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://purelinewellness.com/uploads/1/3/0/7/130740210/130740210.html#relative+clauses+exercises+advanced+with+answers+pdf
    • http://oklahomacitylifecoach.com/uploads/1/3/0/7/130775986/7c799e7a32583f.pdf
    • http://romelocaltourguides.com/uploads/1/3/1/3/131381658/35fbdd846e2.pdf
    • http://extract.in/uploads/1/3/0/6/130639152/6004384.pdf
    • http://skyryanska.com/uploads/1/3/0/7/130776061/8891127.pdf
    • http://stevengethard.com/uploads/1/3/0/5/130588710/7bd828bba23d4.pdf
    • http://royalcrownedhair.com/uploads/1/3/0/7/130775339/2922982.pdf
    • http://doodledesignsandrhymes.com/uploads/1/3/0/4/130477085/deturixaf-gibejure-fapopo-tanadexami.pdf
    • http://offroadwheelchairextreme.com/uploads/1/3/0/6/130621245/678537.pdf
    • http://betsybower.com/uploads/1/3/0/7/130776260/2126012.pdf
    • http://vincemagana.com/uploads/1/3/0/7/130775370/7028906.pdf
    • http://elginberganza.com/uploads/1/3/0/8/130814296/d82afc1e866cb.pdf
    • http://julzglitzgang.com/uploads/1/3/0/6/130639882/juxozewidu.pdf
    • http://kylaevans.com/uploads/1/3/0/7/130738507/talufosejevemofoda.pdf
    • http://airductcleaningexpertsboyntonbeach.com/uploads/1/3/0/7/130775916/7226938.pdf
    • http://iamericcash.com/uploads/1/3/0/7/130740026/3439056.pdf
    • http://thecrstudents.com/uploads/1/3/0/5/130590511/gowejex.pdf
    • http://13weekmap.com/uploads/1/3/0/8/130874358/6427001.pdf
    • http://arisecare.net/uploads/1/3/1/8/131856285/5660816.pdf
    • http://interfacehr.com/uploads/1/3/1/4/131483229/9065300.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065e4.bin
970da6800d96b629d5314663df29ac6ddf8bf3bcb13b9e980669324cc6c75aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E4 10556 bytes

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