Malicious PDF — malware analysis report

Static analysis result for SHA-256 85da0f0a33aba330…

MALICIOUS

PDF

31.6 KB Created: 2020-06-13 05:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2454078782844f92e7f5e76734c544cf SHA-1: 0478ad8eec942f3c4826bafdef3e43c1ebd2d31d SHA-256: 85da0f0a33aba330b3f73636cf914a083de100db7e76e0d325118cd7a5fbc53a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution network. The ML_NYX_PDF_MALICIOUS heuristic also flagged this file with high confidence. No scripts were extracted from this sample, but the sheer volume of external links points to a malicious intent, likely to manipulate search engine results or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://waxinghonolulu.com/uploads/1/3/0/5/130550925/130550925.html#droylsden+Fu%25C3%259Fballverein+Funktionsrau
    • http://server3.districtsolutions.net/uploads/1/3/1/4/131437978/sexojo.pdf
    • http://taylormaids.org/uploads/1/3/1/0/131071145/borosapidoso-jetesemikakiwi-zawifuvukad.pdf
    • http://mta-sts.westportyouthcommission.org/uploads/1/3/0/7/130776641/gozuju_gikipobazeruv_tiwovaxu.pdf
    • http://minimedellin.com/uploads/1/3/0/5/130550652/jidapiveregi-fevitujekadilad.pdf
    • http://craigsoklahomapride.com/uploads/1/3/1/6/131636782/552766.pdf
    • http://thefurnitureguy.net/uploads/1/3/0/4/130435794/waxakun.pdf
    • http://3ka.undesirable.us/uploads/1/3/0/9/130969703/a8b95.pdf
    • http://michaelphagen.com/uploads/1/3/0/6/130621765/nopafeturulixe.pdf
    • http://greenwichmusiclessons.com/uploads/1/3/0/8/130814687/nefuvo_dakolij.pdf
    • https://sapofavef.files.wordpress.com/2020/06/dojunozekipum.pdf
    • https://vamukamavo.files.wordpress.com/2020/06/kisoluwaji.pdf
    • https://bujadite.files.wordpress.com/2020/06/bosefegujejuveve.pdf
    • https://pawisizepetu.files.wordpress.com/2020/06/85507701683.pdf
    • https://wobuzitij.files.wordpress.com/2020/06/95278425494.pdf
    • https://josejoxoboko.files.wordpress.com/2020/06/74396145625.pdf
    • https://gorajeg.files.wordpress.com/2020/06/wuvuvumagugazoweb.pdf
    • https://veluzadisifa.files.wordpress.com/2020/06/dupapevixe.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_off00004fe8.bin
5315af4b6e904a218021a9bd734e76f64e9e92e000eb2541e384712051cf69b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE8 9648 bytes