Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69bba26eb9d67cd…

MALICIOUS

PDF

41.9 KB Created: 2020-05-18 07:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 727c4564fef8bb197555cb867d1736a2 SHA-1: d514fd8703c455226585a66aa8fd3a5a91fa914c SHA-256: d69bba26eb9d67cd1fcbbc66419c5aa1c57b370478b2dd359312a1bb0b2f5782
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, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'Calculus 2 final exam with answers pdf' and references the wkhtmltopdf tool, suggesting a lure to potentially malicious or SEO-spam content. The primary attack pattern involves directing users to a vast network of external URLs, likely to distribute further malware or engage in link farming. No scripts were extracted from this sample.

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://salon-twenty5.com/uploads/1/3/0/6/130639152/130639152.html#calculus+2+final+exam+with+answers+pdf PDF link annotation
    • http://ashleighmaund.com/uploads/1/3/1/6/131637152/sogoralolumata.pdfIn PDF document text
    • http://fischerjohnson.com/uploads/1/3/1/4/131407021/naderiv-xejeko-rekokel.pdfIn PDF document text
    • http://clippertrimmerparts.com/uploads/1/3/0/5/130588240/6471869.pdfIn PDF document text
    • http://taticoffee.nl/uploads/1/3/0/7/130775698/kogopesigexoz_xumegataliwetug_tesufiruwisogud.pdfIn PDF document text
    • http://puertoplatashorexcursions.com/uploads/1/3/1/4/131482864/8156127.pdfIn PDF document text
    • http://vitalitymedicalinfusion.com/uploads/1/3/1/6/131606473/vupapifolaw-raferad-xudirafuropov-fazaputosose.pdfIn PDF document text
    • http://precisionstrategy.org/uploads/1/3/0/3/130324292/3759534.pdfIn PDF document text
    • http://salazaryaguirre.com/uploads/1/3/1/8/131856129/wovovajokim_jebaziwo_xazolile_namajume.pdfIn PDF document text
    • http://innerfaithdisciplehouse.net/uploads/1/3/1/6/131636824/vaxulapin.pdfIn PDF document text
    • http://ribbonmemories.com/uploads/1/3/1/6/131607930/rigaw.pdfIn PDF document text
    • http://emekberaka.com/uploads/1/3/0/6/130605256/retul_figinisabi_mewafejedefi.pdfIn PDF document text
    • http://takachmechanical.com/uploads/1/3/0/7/130738754/e4d1d16.pdfIn PDF document text
    • http://flowboardusa.com/uploads/1/3/0/7/130739729/jumev-femobuxemisuwor-ruzepixabopur.pdfIn PDF document text
    • http://bigshootermusic.com/uploads/1/3/0/4/130436140/kofusojawalisikeba.pdfIn PDF document text
    • http://aziragroup.com/uploads/1/3/0/2/130291527/sofelagerobexe.pdfIn PDF document text
    • http://blinginitout.com/uploads/1/3/0/8/130814715/wotimot.pdfIn PDF document text
    • http://marc-brown.com/uploads/1/3/0/6/130639593/nefusonara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7619 10560 bytes
SHA-256: 890690200a7df77e984b6e6e925784d188494e178c82a371bf9b3dfa4db962de

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