Malicious PDF — malware analysis report

Static analysis result for SHA-256 331d608cb36f7223…

MALICIOUS

PDF

39.0 KB Created: 2020-06-17 06:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c48dbb899363b5260dbc5433297172 SHA-1: 482d9f306f234a1d0a1f415e7d6f0321ae1514f1 SHA-256: 331d608cb36f7223bd4ff60c4144dd75753982d8ff08a2f0969489ff6c3b44f8
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or phishing. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains references to 'Mallorca travel guide' and URLs, reinforcing the lure. The primary intent appears to be directing users to potentially malicious external sites.

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://dev.paragon-ca.com/uploads/1/3/0/4/130477663/130477663.html#mallorca+travel+guide
    • http://heartlandjoy.com/uploads/1/3/1/8/131856068/bojomidunexomejudero.pdf
    • http://oldwillowcomplex.com/uploads/1/3/0/2/130289611/nifujukosusaz.pdf
    • http://canadafinanceandlease.com/uploads/1/3/0/4/130476565/9106308.pdf
    • http://mihempfest.com/uploads/1/3/0/2/130288798/a543163b21289.pdf
    • http://bakeitsg.com/uploads/1/3/0/6/130604319/3528511.pdf
    • http://oldaleandsons.org/uploads/1/3/1/3/131384113/4011499.pdf
    • http://pragmaticpreacher.org/uploads/1/3/0/4/130476483/kekuvoxavak_xelef_nibadijeri_fadoleda.pdf
    • http://warrenstratton.com/uploads/1/3/1/0/131070356/ritinopuk.pdf
    • http://mail.dolphinvacations.net/uploads/1/3/0/7/130776260/linuwexizaxu.pdf
    • http://mta-sts.mail.pdxcommercialcoatings.com/uploads/1/3/0/4/130478772/koxakigozopefap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cc2.bin
b47ff893c68ba103f112410e42bf706fedc5501e8d7bd677c6651c312e579fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC2 4768 bytes
font_01_sfnt_off00006d14.bin
b8089cbc506de6649dba4412ab9919ad474b86863645abadd93f12b62bf9f42d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D14 10440 bytes

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