Malicious PDF — malware analysis report

Static analysis result for SHA-256 4219823e6655d9b7…

MALICIOUS

PDF

41.8 KB Created: 2020-05-16 18:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12d3234c48d64c696eb35fb2a6f9fbd4 SHA-1: b3f660fa9c4ce3a739edf897cb6b656b6b5b3ca1 SHA-256: 4219823e6655d9b7d533e9a6530cb6a50cded2ed653b776f8ce5797828339a27
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO spam or phishing campaigns. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'unanswered calls meme' and the URLs themselves are structured in a way that suggests automated generation for link farming. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tartelaine.com/uploads/1/3/0/6/130621334/130621334.html#unanswered+calls+meme
    • http://nathaliablachford.com/uploads/1/3/1/4/131438874/tefajarubesezakefa.pdf
    • http://issera.de/uploads/1/3/0/6/130603955/2eb9b.pdf
    • http://luxbbg.org/uploads/1/3/1/6/131606056/vubiwizazakuruxisek.pdf
    • http://cornislandrentals.com/uploads/1/3/0/7/130775545/mebalunewu_kukikirokep_zixikamub_ruwelizelibik.pdf
    • http://brynnmaenhoutphotography.com/uploads/1/3/1/3/131379894/9933617.pdf
    • http://getfitchef.com/uploads/1/3/1/4/131437623/naxovig_duxijifijopo.pdf
    • http://pathwaystoyourpotential.com/uploads/1/3/1/4/131453520/6660184.pdf
    • http://electronpappas.com/uploads/1/3/1/6/131606347/kekukififuvitun_zozowug_lawonavovilipu.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_off000079db.bin
eee9d10321819bdabf8808e5365403b8492cc6fd29a08eb2d1bf1b816aff03e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DB 10180 bytes

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