Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa5e6463c1c6e32…

MALICIOUS

PDF

40.5 KB Created: 2020-04-02 03:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f09098804f166f718dd81d0082592201 SHA-1: 2a4e17af1e556a7a1c30876a12eb0cdaf5d4f12b SHA-256: 7fa5e6463c1c6e32019e7407565b6a9c704fe8a0be15247bc49900af2039b82c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The embedded URLs are likely used to direct users to malicious content or phishing pages, rather than for direct execution of a payload from within the PDF itself.

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://northwestuu.com/uploads/1/3/0/8/130814254/130814254.html#funciones+del+lenguaje+referencial+apelativa+y+expresiva
    • http://lamonthunter.com/uploads/1/3/0/9/130968925/tijetiwebujixo.pdf
    • http://homeboxzero.com/uploads/1/3/0/5/130588842/9644083.pdf
    • http://wodscorecard.com/uploads/1/3/0/2/130271240/2624161.pdf
    • http://seamlouisville.org/uploads/1/3/1/4/131453620/wurazafazutan.pdf
    • http://karimdudum.com/uploads/1/3/0/6/130620506/tatujejiw.pdf
    • http://seelooinc.com/uploads/1/3/0/6/130639310/5694952.pdf
    • http://vishnusriram.com/uploads/1/3/1/4/131407846/senubuwelodilomu.pdf
    • http://ingascony.com/uploads/1/3/0/6/130604742/762633.pdf
    • http://aherpelsiue.com/uploads/1/3/0/5/130590431/xanopid.pdf
    • http://noveaucontourus.com/uploads/1/3/0/8/130874219/12494.pdf
    • http://salescolor.nl/uploads/1/3/0/7/130740318/semowexu.pdf
    • http://cmarquezeportflio.com/uploads/1/3/0/6/130640133/6b05b303.pdf
    • http://clydeantronerpottery.com/uploads/1/3/1/0/131071253/42671848b768.pdf
    • http://pulleyauto.co/uploads/1/3/1/3/131379037/kigibisufimif.pdf
    • http://enitslife.com/uploads/1/3/0/7/130740510/9014479.pdf
    • http://bm-photography-uk.com/uploads/1/3/0/5/130589125/b8d2a2a1.pdf
    • http://donotforgetme.org/uploads/1/3/0/6/130603907/4581ca43baf7.pdf
    • http://invest-mongolia.mn/uploads/1/3/0/9/130969647/pemav_xinuna_xukurije_fizoxiwen.pdf
    • http://magnoliaministriesandcounselingcenter.com/uploads/1/3/1/0/131069915/kofuwogakav.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_off000070ec.bin
f89c50b03c2cdeddf17c4e32fca05c40736ac7a9909b587000d27ac296fbaecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EC 9388 bytes

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