Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb99ef785334686…

MALICIOUS

PDF

38.0 KB Created: 2020-06-24 01:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 6c9c9fdbb39ef077f74c93d559462182 SHA-1: dbaf4fcf8cdc1ab3d7aba1ab1fa8e3b3f879682b SHA-256: aeb99ef785334686fbce4b269de7b9586eb89e5314b94d82c1e3b316392a2e74
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, also contains URLs. These links likely lead to malicious content or are part of an SEO manipulation scheme. No scripts were extracted from this sample.

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://mail.bebirdtravel.com/uploads/1/3/1/4/131437172/131437172.html#martisoare+crosetate+manual PDF link annotation
    • http://webdisk.nspaintingservices.com/uploads/1/3/1/3/131397930/fudedomodulozitowi.pdfIn PDF document text
    • http://ashleywilson.gallery/uploads/1/3/0/6/130620701/6298533.pdfIn PDF document text
    • http://insuranceconnected.net/uploads/1/3/0/6/130620237/6293758.pdfIn PDF document text
    • http://cashingproperties.net/uploads/1/3/0/5/130540926/zinafa.pdfIn PDF document text
    • http://kensleigh.com/uploads/1/3/0/9/130968915/lovabudasizujamikaxo.pdfIn PDF document text
    • http://thebarigray.com/uploads/1/3/1/3/131379945/6167142.pdfIn PDF document text
    • http://customartpresentation.com/uploads/1/3/1/0/131070527/d20c2b.pdfIn PDF document text
    • http://kerumunan.com/uploads/1/3/0/5/130589006/minuju.pdfIn PDF document text
    • http://webdisk.innovativecare4u.com/uploads/1/3/0/7/130740113/vimiderisolene.pdfIn PDF document text
    • http://webmail.paulbartonmusic.com/uploads/1/3/0/2/130289315/4690328.pdfIn PDF document text
    • http://growerschoicebank.com/uploads/1/3/1/4/131455158/zijukowopu_tovelukasiweka_kesafogofud.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52CF 4832 bytes
SHA-256: f5795374b646edcd1e7a3eaa12106c60819f828b397fa3c60263641b224d8c19
font_01_sfnt_off0000631e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631E 12764 bytes
SHA-256: d47536e40893a6ac4207c613a616d3c096098551fa03da511b150250bb61e5a1