Malicious PDF — malware analysis report

Static analysis result for SHA-256 9821d0098356eeb0…

MALICIOUS

PDF

33.3 KB Created: 2020-04-04 14:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a8e4c5aabffdf04f97ed37c366ac0c76 SHA-1: 118cfff68d4f01524c94d89803d174bd1489821b SHA-256: 9821d0098356eeb05882ca48f2c365d5eb3ef59bd13e20da3603b1e9b72c12c8
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO poisoning or directing users to malicious sites. The document body, though partially corrupted, suggests a lure related to a 'class plan'. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates a malicious intent to link to a large number of external resources. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://eserveway.com/uploads/1/3/0/7/130740298/130740298.html#plan+de+clase+de+ingles+grado+segundo PDF link annotation
    • http://dariyoosh.com/uploads/1/3/0/3/130323311/wizisorezir_zepupibur_wikisegekutera.pdfIn PDF document text
    • http://thecurvycamper.com/uploads/1/3/1/3/131383536/1542385b5fc.pdfIn PDF document text
    • http://powellrdcoc.org/uploads/1/3/0/3/130379549/nevewujoraxefuw-jodepemolozem-gijukulum.pdfIn PDF document text
    • http://calprivacy.com/uploads/1/3/0/6/130639141/ditosi.pdfIn PDF document text
    • http://judyjankowski.com/uploads/1/3/0/8/130813997/vetozet_vunawaj_denuragun_jotado.pdfIn PDF document text
    • http://secretnewhomeguide.com/uploads/1/3/0/5/130590054/b73080bec34be6e.pdfIn PDF document text
    • http://mosaico.ch/uploads/1/3/0/2/130270986/jeliduriderakonox.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

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_off00005758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5758 8892 bytes
SHA-256: 533fde888f205ee7c56d319340cef5f7833fa26efe422bdab2d32e58d6cd2784

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