Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d369bc0f2a0169…

MALICIOUS

PDF

35.2 KB Created: 2020-04-03 05:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: baca2b29212169eb641a5e352c10a724 SHA-1: c3ae8128fdafc23fa576cedd2abc30c28b145747 SHA-256: 71d369bc0f2a01692f6a07633cc1d161fe1a8d69be74dc5a021d474667e9f2d2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which follow a pattern of numeric slugs and appear to be part of a link farm. The document body, though heavily obfuscated, contains references to product names and URLs, suggesting a lure for SEO spam or phishing. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rcklaframes.com/uploads/1/3/0/6/130604532/130604532.html#sony+clock+radio+icf-c218
    • http://jessicaazrin.com/uploads/1/3/0/5/130551126/filotatididazef_pajiwavola.pdf
    • http://mariaevangelizadoraradio.net/uploads/1/3/0/3/130313440/tafosu.pdf
    • http://topephoto.com/uploads/1/3/0/6/130639141/tagalumafubi.pdf
    • http://omakasesac.com/uploads/1/3/0/2/130273762/7071200.pdf
    • http://foodislifecincy.com/uploads/1/3/0/7/130738911/zetatizibajat.pdf
    • http://me210team25win19.com/uploads/1/3/1/4/131453735/jodideb-dekopunoxa-xarenuxo-regizunupan.pdf
    • http://ejmbusinessdesigns.com/uploads/1/3/0/6/130640172/8856868.pdf
    • http://scaspartanclub.org/uploads/1/3/0/8/130813373/2976292.pdf
    • http://kidsclubasia.com/uploads/1/3/0/5/130588796/kukujor.pdf
    • http://maggietham.com/uploads/1/3/0/5/130540172/2660465.pdf
    • http://denisejeffries.com/uploads/1/3/0/9/130969855/e7d45.pdf
    • http://annabellaofbowwowwow.com/uploads/1/3/0/2/130270779/vavunezoraxop-nawasazinedupaz-wobakuto.pdf
    • http://fngproperties.net/uploads/1/3/0/7/130740492/putekirunuf_dujapa_mumumutik_najebafe.pdf
    • http://hook.flights/uploads/1/3/0/7/130775598/9cb5561b6.pdf
    • http://miriamlane.com/uploads/1/3/1/0/131071041/wifoxagude.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e8.bin
f7d80f5fb1308c4fcde6efd6bc341362272a626df00f4923abe1ef5c1782403d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E8 7568 bytes

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