Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdab558c9e4211a…

MALICIOUS

PDF

45.6 KB Created: 2020-03-23 04:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 43c33428ec9a727cbda486086ae274d8 SHA-1: aed1d1c76d099af12facdff9e66c524637444f20 SHA-256: ffdab558c9e4211ab8aef16f1e92d7b00c4c9b33b25e6f32b8d35c0c334d8b7e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The document body contains metadata suggesting it was generated by wkhtmltopdf, and the embedded links are likely intended to manipulate search engine results or lead users to malicious sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://speelkoning.net/uploads/1/3/0/6/130621337/130621337.html#gestion+de+calidad+pdf+libro PDF link annotation
    • http://finplancg.com/uploads/1/3/0/4/130483428/2978883.pdfIn PDF document text
    • http://ishanrealtor.com/uploads/1/3/0/9/130969647/lukexixopubateluruje.pdfIn PDF document text
    • http://spectreanalysis.com/uploads/1/3/0/5/130543169/gepunurum_kefix_pitugupusome_pupefepefona.pdfIn PDF document text
    • http://gastricbypassdoctors.com/uploads/1/3/0/8/130873918/1742737.pdfIn PDF document text
    • http://kathleensilks.com/uploads/1/3/0/6/130604788/poxoterofivamuvazeni.pdfIn PDF document text
    • http://thegreenbunnystore.com/uploads/1/3/0/5/130551700/4aebb4ef52.pdfIn PDF document text
    • http://kenya-help.org/uploads/1/3/0/5/130551013/b5cb26.pdfIn PDF document text
    • http://tasticle.com/uploads/1/3/0/5/130551229/dejizeravapux_zafon_wanada_xelasefepitumu.pdfIn PDF document text
    • http://helpmedomore.com/uploads/1/3/0/8/130814120/e2965660f.pdfIn PDF document text
    • http://runningtoosuccess.com/uploads/1/3/0/5/130539093/gufime-juselo-fekoru.pdfIn PDF document text
    • http://hostmaster.opticomm.nl/uploads/1/3/0/4/130483163/a91c5240b0dc1.pdfIn PDF document text
    • http://galenetics.org/uploads/1/3/0/5/130588213/92b3438e04571.pdfIn PDF document text
    • http://annemarieguarnieri.com/uploads/1/3/0/6/130639518/f3dbbe2126.pdfIn PDF document text
    • http://cutleryclubofamerica.com/uploads/1/3/0/6/130604243/9204652.pdfIn PDF document text
    • http://www.zhangyiliwork.com/uploads/1/3/0/4/130435888/fijitiremo-zururimal-xajojer-nunikurusev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B8 9144 bytes
SHA-256: 3140ba33c3687e76aa3ac5de86d208108ee5f3708c11f2557972da9922c25e1e