Malicious PDF — malware analysis report

Static analysis result for SHA-256 485f6a3f3d3709ad…

MALICIOUS

PDF

52.4 KB Created: 2020-06-21 07:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: ffcff31f89682fe74c9099bac2345084 SHA-1: 9ef53b77fc3711af18895bac2b9db599cd40516e SHA-256: 485f6a3f3d3709adcbefb11f00b28b3c2ac408b191b7c21c3c6afad760f0f4a9
144 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to mimic legitimate content, such as repair manuals. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that the document may be instructing the user to open a password-protected archive, a common tactic to bypass security filters. The presence of multiple unknown URLs indicates a potential distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yjopg.bpmtc.com/uploads/1/3/0/4/130483650/130483650.html#mitsubishi+ecu+repair+manual PDF link annotation
    • http://webdisk.meandpj.com/uploads/1/3/0/4/130488699/2788795.pdfIn PDF document text
    • http://bmconsultoria.net/uploads/1/3/1/8/131856971/2705371.pdfIn PDF document text
    • http://iecclesiacanada.com/uploads/1/3/0/4/130489909/1401340.pdfIn PDF document text
    • http://mail.curiouscata.com/uploads/1/3/0/5/130588698/sokepozazozesuzexasu.pdfIn PDF document text
    • http://carriageclassic.org/uploads/1/3/1/3/131381240/bb0a3c2dba6a53.pdfIn PDF document text
    • http://privada-prod.jovenesadelante.org/uploads/1/3/0/6/130621544/mokuvaduxegapij-xavifudixasol-guvofefiwexago-zelonevigof.pdfIn PDF document text
    • http://returnedgardenstock.com/uploads/1/3/1/8/131856771/5441d5c575af.pdfIn PDF document text
    • http://knitvegan.com/uploads/1/3/0/5/130551756/xagenufipotadirogir.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 5

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0B 5088 bytes
SHA-256: a4ea4fe9ad706e29fd84f6ad85bbd609e3bdc1f6720fbdcaea04a007e1f09371
font_01_sfnt_off00009b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B25 13252 bytes
SHA-256: 00b66c69f93c3ddf2467b865f62d4d01ef06019abdb3d588e9c190ba3c661b97

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