Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7e7948223d4504…

MALICIOUS

PDF

40.2 KB Created: 2020-04-03 00:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c86c6e13d39b70a8d78971b9910baecf SHA-1: 27217475bbfa7a08eee601c45bcb99cd4f10ecc0 SHA-256: 8c7e7948223d450443084cfa999d28731268e9b15d2d94104864875fba1cb14d
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains the title 'Mujeres que corren con lobos' and metadata indicating it was generated by wkhtmltopdf. The primary attack pattern involves directing users to a vast collection of other PDF files hosted on numerous domains, suggesting a link farm or a method to distribute potentially malicious content or engage in SEO spam. No scripts were extracted from this sample.

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://speelkoning.net/uploads/1/3/0/6/130639583/130639583.html#mujeres+que+corren+con+lobos
    • http://pantherinternationalsecurity.com/uploads/1/3/0/9/130969568/60535.pdf
    • http://torosyole.com/uploads/1/3/0/8/130813819/gozojedosimutu-delifulekud-vefususuvabo.pdf
    • http://lgbtqsafespace.com/uploads/1/3/0/5/130590371/2420612.pdf
    • http://jandersonartist.net/uploads/1/3/0/8/130874522/davanat.pdf
    • http://automotoreslaplata.com/uploads/1/3/0/8/130874213/3452534.pdf
    • http://lipodoctoratlanta.com/uploads/1/3/0/5/130551154/782ed14a9c.pdf
    • http://happyearthherbals.com/uploads/1/3/0/2/130272267/7695983.pdf
    • http://trattorianinaarlingto.com/uploads/1/3/1/4/131453657/ab97d4c1e18fb.pdf
    • http://dinebeautiful.com/uploads/1/3/0/2/130271187/musefutuw.pdf
    • http://obryantdesignscapesllc.com/uploads/1/3/0/6/130620719/2974566.pdf
    • http://cld.nu/uploads/1/3/0/3/130323523/65d936f4.pdf
    • http://isrsurvivalswimming.com/uploads/1/3/0/4/130483819/80c69c92e03d.pdf
    • http://rodneyreedbailbonding.org/uploads/1/3/0/6/130604386/aaeda6620767.pdf
    • http://therhinelandtograceland.com/uploads/1/3/0/9/130969297/neguturokorusus.pdf
    • http://zedys.com/uploads/1/3/0/4/130490078/85bff0619.pdf
    • http://rc7multservicos.com/uploads/1/3/0/6/130604294/nawafuzova-kixomiwuke-karemovux-mogal.pdf
    • http://alevelsciencesupport.com/uploads/1/3/0/7/130775203/tipob_gapog_ziduxinebexin.pdf
    • http://electstuartcollis.org/uploads/1/3/0/7/130739007/lekamosesixaja_xosafijefifonag_vigekiwuxiga.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_off000075bf.bin
68650043ebb8ecf889b952df6108805b502eea173dc8aa359693c4cb698fd7ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BF 8072 bytes

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