Malicious PDF — malware analysis report

Static analysis result for SHA-256 67125f8fa1aa8790…

MALICIOUS

PDF

32.8 KB Created: 2020-06-04 22:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10e2e3793b4f41611d0988cb167193a7 SHA-1: 0e9a3563f30645dc2b33efeb200defd4658ceee4 SHA-256: 67125f8fa1aa8790742a5e7cc3e541357a3b26d805f4b81d60495891df5e88f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a PDF link farm, likely intended to manipulate search engine results. The document body text and embedded URLs suggest a lure for free book downloads. While no scripts were extracted, the heuristic firings strongly indicate a malicious intent to direct users to potentially harmful content or exploit SEO tactics for malicious purposes.

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://mycartilage.com/uploads/1/3/0/7/130739906/130739906.html#fake+book+download+free
    • http://rentholidaycottages.com/uploads/1/3/0/8/130874369/viwofojisumom.pdf
    • http://immaximized.org/uploads/1/3/0/6/130639100/f7493c.pdf
    • http://schgoc.com/uploads/1/3/1/0/131070713/batodagavagi.pdf
    • http://slimnotfat.com/uploads/1/3/0/5/130588588/mutijebaza.pdf
    • http://uticaforall.org/uploads/1/3/1/4/131408397/wunevepoboliza_vosudodona_venimasa_tulelo.pdf
    • http://stratfordnests.com/uploads/1/3/0/2/130288818/bebak_bitog.pdf
    • http://laurence-blum.com/uploads/1/3/0/6/130604191/8419806.pdf
    • http://zachyentzer.com/uploads/1/3/0/6/130640095/d8e95826.pdf
    • http://mycartilage.com/uploads/1/3/0/7/130739906/terms.html
    • http://mycartilage.com/uploads/1/3/0/7/130739906/dmca.html
    • http://mycartilage.com/uploads/1/3/0/7/130739906/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sosinogezop.files.wordpress.com/2020/06/19488530520.pdf
    • https://reminowi292996721.files.wordpress.com/2020/06/batixujoku.pdf
    • https://sirozujulad.files.wordpress.com/2020/06/gutagubim.pdf
    • https://fiwukezebara.files.wordpress.com/2020/06/55949170893.pdf
    • https://xotibeziwivu.files.wordpress.com/2020/06/xagixadoseroliju.pdf
    • https://mesazefa.files.wordpress.com/2020/06/delakebizoripanelabef.pdf
    • https://gadaxug.files.wordpress.com/2020/06/73077066405.pdf
    • https://muxoxufok.files.wordpress.com/2020/06/34751529236.pdf
    • https://bilivogeji390496675.files.wordpress.com/2020/06/gurodizimeriniwifijifen.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055c4.bin
ba54b047c7d16769918e62290f8da2507ecafb772daa794623b7e8d09b749327
pdf-font-stream PDF embedded font (sfnt) at offset 0x55C4 9832 bytes