Malicious PDF — malware analysis report

Static analysis result for SHA-256 092dbefc7c95f431…

MALICIOUS

PDF

44.4 KB Created: 2020-06-06 12:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a816341510e5ca72ccc7084e2f3d6905 SHA-1: d051849628503bdde169312d3e9873734cfe4a96 SHA-256: 092dbefc7c95f431b5334c3807479d6b62915244f7d13004b1048676c877e5ed
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external URLs points towards a potential phishing or malicious content distribution scheme, possibly related to spearphishing attachments.

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://bobandsteveshow.com/uploads/1/3/0/4/130478438/130478438.html#isuzu+mux+owners+manual
    • http://lebanonvalleydc.com/uploads/1/3/1/1/131164054/59a543.pdf
    • http://babysfirststories.com/uploads/1/3/0/9/130969834/f0028dd4.pdf
    • http://builtmindsets.com/uploads/1/3/1/4/131453247/099f10f40fed0.pdf
    • http://washtenawcountyhomeinspector.com/uploads/1/3/0/7/130776042/2a787f08e1967.pdf
    • http://madeitinmetal.com/uploads/1/3/0/5/130551164/771043.pdf
    • http://agknives.net/uploads/1/3/0/4/130488704/691160.pdf
    • http://docthackerys.com/uploads/1/3/0/7/130775309/forukobojonebov_lakikolotokoro_zumuxe.pdf
    • http://autodiscover.thankfulrecords.com/uploads/1/3/0/7/130776049/5328660.pdf
    • http://grampascookin.com/uploads/1/3/0/5/130551654/jatumajisenugexekige.pdf
    • http://bobandsteveshow.com/uploads/1/3/0/4/130478438/terms.html
    • http://bobandsteveshow.com/uploads/1/3/0/4/130478438/dmca.html
    • http://bobandsteveshow.com/uploads/1/3/0/4/130478438/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://borafitafule.files.wordpress.com/2020/06/85254945945.pdf
    • https://kozopawowopu.files.wordpress.com/2020/06/jisalevivorafomixudifijot.pdf
    • https://regaxunizi.files.wordpress.com/2020/06/73875428103.pdf
    • https://nelagudisuz.files.wordpress.com/2020/06/zifexeraxapawelirososob.pdf
    • https://kifukixu.files.wordpress.com/2020/06/71846099665.pdf
    • https://tenadeluzob.files.wordpress.com/2020/06/74742427203.pdf
    • https://wufabok.files.wordpress.com/2020/06/wapulobitofel.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_off000080b2.bin
e2c2961abd0c2623294c572dd58ce2ffc0ba06d8b250723fb75fa1a1b4672c27
pdf-font-stream PDF embedded font (sfnt) at offset 0x80B2 10876 bytes