Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f3e4620ebda236…

MALICIOUS

PDF

62.0 KB Created: 2020-04-11 23:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 0677022b011fdc9c45a62f328a02781b SHA-1: 18dd36ff0047beeb564bf9b4ddcb4e6b5d7563b4 SHA-256: c2f3e4620ebda2362cb6dd607693939cc4f0b6fc0a044fea7dd44b8d831f529a
116 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to domains that appear to be part of a link farm. The document body, though partially corrupted, includes a URL that is also present in the heuristics, suggesting a lure to external content. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing a mass of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://budgettravel101.com/uploads/1/3/0/3/130379389/130379389.html#sintesis+de+la+pared+de+peptidoglicano PDF link annotation
    • http://tooprettyforjail.net/uploads/1/3/0/6/130603842/6552116.pdfIn PDF document text
    • http://gilsonwerneck.com/uploads/1/3/1/4/131483603/wulibal-zigifiseduxow-tanuvunejuval.pdfIn PDF document text
    • http://emiliafeliz.com/uploads/1/3/0/5/130588620/c33c7d06061e6dc.pdfIn PDF document text
    • http://icejewellers.com/uploads/1/3/0/7/130739557/692ad44ca129480.pdfIn PDF document text
    • http://adventurephotography.ca/uploads/1/3/0/6/130620467/surob.pdfIn PDF document text
    • http://naturallyyounow.com/uploads/1/3/1/0/131070080/f49a757.pdfIn PDF document text
    • http://ultimatemartialartsusa.com/uploads/1/3/0/7/130738614/eb56c429e7.pdfIn PDF document text
    • http://danbaconhistorian.com/uploads/1/3/0/3/130379295/pexuregejive.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 5

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_off0000c53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 10692 bytes
SHA-256: 424a4c7342d2022ffb787025769fe0951bb7c1feed8c39f9ecf2b4d6c7984541

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