Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0c84d4a31402ee…

MALICIOUS

PDF

38.4 KB Created: 2020-04-10 03:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 24d0e8629d0690973b7d9184a4a21c1b SHA-1: a5360b74bced998080951e7bd33b48aeb95d556c SHA-256: 9a0c84d4a31402eea79616a7c779eb23e4c5048b8684651ba12c25128644f436
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, a technique often used for SEO manipulation or to redirect users to malicious sites. The document body, though partially corrupted, contains text related to learning and a tool name, suggesting a lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://253kdavisphotography.com/uploads/1/3/0/8/130873916/130873916.html#como+aprender+a+dividir+por+dos+cifras+videos
    • http://georgiabellydance.com/uploads/1/3/0/9/130969663/momoxokoni_guxizumakuvave_gulonaze.pdf
    • http://americanational.us/uploads/1/3/0/4/130476122/d0931768c02b.pdf
    • http://funfoodwiththefatguy.com/uploads/1/3/0/5/130544001/2df45b147ec55.pdf
    • http://sima-se-design.com/uploads/1/3/0/6/130604406/zamutel_xazurag_rawapapituza.pdf
    • http://bbdigitalphotography.com/uploads/1/3/1/3/131397934/e2b18da0.pdf
    • http://repassage.org/uploads/1/3/1/3/131378915/0e8a200d6.pdf
    • http://allisonsevents.org/uploads/1/3/0/2/130289397/nafup.pdf
    • http://lesaventurieres.net/uploads/1/3/0/6/130620916/e215f135d542.pdf
    • http://extractioncity.com/uploads/1/3/0/6/130604807/3b31388d7.pdf
    • http://wssdar.com/uploads/1/3/1/4/131453213/basirozu.pdf
    • http://a1specialcareltd.com/uploads/1/3/0/7/130776003/nigarise.pdf
    • http://marcolooks.com/uploads/1/3/0/5/130588240/81347d7.pdf
    • http://lillyclinickiev.com/uploads/1/3/0/9/130969618/sivuzemifelezet.pdf
    • http://graft.foundation/uploads/1/3/0/9/130969764/tapinuxepowoza_zejeloxetik_sajozewi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b0b.bin
f455597d5207eb99e59e67c5db9f795845933e3d30b65f0670dc868e229c45a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0B 8600 bytes

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