Malicious PDF — malware analysis report

Static analysis result for SHA-256 74810058a43bc3f2…

MALICIOUS

PDF

38.4 KB Created: 2020-03-31 01:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9cd1d7e96cbf78364cfa8f1bb32a7e83 SHA-1: 63ab0183138b1b93029ecd4ba9ae6166660f68d8 SHA-256: 74810058a43bc3f22bf866cb9010310719bca1942f4b067267fd90d901a8a722
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 document body, though partially corrupted, contains text related to a parts list and references to wkhtmltopdf, indicating it was likely generated programmatically. The presence of numerous external URLs, including one pointing to an HTML file and others to PDF files, strongly suggests a malicious intent to redirect users to potentially harmful content or to manipulate search engine rankings. No scripts were extracted, but the structure and heuristics point to a malicious PDF.

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://mmhac.com/uploads/1/3/0/5/130546036/130546036.html#kenmore+electric+range+model+790+parts+list
    • http://nievex.com/uploads/1/3/0/6/130621839/45827555226.pdf
    • http://thsdiscovery.com/uploads/1/3/0/7/130776393/2761941.pdf
    • http://techtronicmobile.com/uploads/1/3/0/6/130639827/6fcd786.pdf
    • http://molivery.ee/uploads/1/3/0/6/130639539/zujitememilo_jozobu.pdf
    • http://morecleanlessdirty.com/uploads/1/3/0/3/130313306/7068456.pdf
    • http://patrimoinesaintelucie.com/uploads/1/3/0/2/130274304/vigeb_bebelax.pdf
    • http://weefca.com/uploads/1/3/0/4/130435516/wiraxal.pdf
    • http://adeptwoodwork.com/uploads/1/3/0/7/130740513/5774209.pdf
    • http://charminechoi.com/uploads/1/3/1/1/131163854/6b2d59eca.pdf
    • http://jerrystover.net/uploads/1/3/0/7/130739627/tomowafifodofav_xolisesoxunejub.pdf
    • http://southernoregondhhed.com/uploads/1/3/0/5/130540182/5940266.pdf
    • http://add-focus.com/uploads/1/3/0/8/130874480/c761afe51481db1.pdf
    • http://vlvassells.com/uploads/1/3/0/8/130813956/afc1a3eb8.pdf
    • http://4wardthinkconsult.com/uploads/1/3/0/7/130740087/8027834.pdf
    • http://diagmal.eu/uploads/1/3/0/4/130490151/juxisedavoliluzez.pdf
    • http://kaleidoscoperecords.net/uploads/1/3/1/3/131383514/zukuwod.pdf
    • http://trentsoyster.com/uploads/1/3/0/3/130313339/abec0bec20.pdf
    • http://devongoldmakeup.com/uploads/1/3/0/5/130588554/zibufa.pdf
    • http://facebandit.com/uploads/1/3/0/8/130813732/rexiwaviwox_tageganamiwoku_xijugaguxusen.pdf
    • http://mikaylaellise.com/uploads/1/3/0/9/130969301/9153611.pdf
    • http://garlandcountycd.com/uploads/1/3/0/3/130313495/suximujap.pdf
    • http://sbcihurtsworkers.com/uploads/1/3/0/7/130775259/3410539.pdf
    • http://pathtogreat.org/uploads/1/3/0/6/130621264/zigopureketem.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_off00006f02.bin
9f09a8d3a0c74fbb9e1b08192d4f3c41444198f4cb71a087fa18c4748bc213d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F02 7268 bytes

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