Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf347a7e3184f43f…

MALICIOUS

PDF

31.8 KB Created: 2020-06-01 12:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e61189be984c534c03f5411ec0cdd8d0 SHA-1: 7f562051777a3ab4b9c0cb7c360215304d1d6e25 SHA-256: bf347a7e3184f43fb3dcacc39a7494df8681771d8f9bd58c3118505f632c786a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains a nonsensical phrase and the authoring application suggests it was generated programmatically, likely to create a link farm for SEO poisoning or to distribute further malicious content via the numerous linked PDFs.

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://markahope.net/uploads/1/3/1/3/131384618/131384618.html#pomf+pomf+what%2527s+this+sticky+stuff+on+me
    • http://supinealign.com/uploads/1/3/1/0/131070116/tedilarapolijipajal.pdf
    • http://sierrajessicaphotography.com/uploads/1/3/0/5/130551720/tudakaponitijenaxajo.pdf
    • http://alterationscscom.com/uploads/1/3/0/6/130605269/sijepun_baroma.pdf
    • http://primestaffing.net/uploads/1/3/0/2/130289441/suvubin-simavarul-misorutap.pdf
    • http://mx.marksmancamp.com/uploads/1/3/0/3/130313013/4425765.pdf
    • http://1customerwon.com/uploads/1/3/0/2/130289583/kusejaxutosodupolese.pdf
    • http://anitayorkstories.com/uploads/1/3/1/3/131383933/gokogupuruji_gopekoxoki_tavalijeki_pilibado.pdf
    • http://lebensfunke.at/uploads/1/3/0/4/130476575/6767328.pdf
    • http://carrieladue.com/uploads/1/3/0/6/130621383/551192.pdf
    • https://bokilafeta.files.wordpress.com/2020/05/78332953876.pdf
    • https://javasevob.files.wordpress.com/2020/05/laket.pdf
    • https://dufaxuxed.files.wordpress.com/2020/05/xumigezeketivovosobega.pdf
    • https://pepavujewow.files.wordpress.com/2020/05/36944511685.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_off000051f1.bin
3b27fedb4ea81e0004e01c0670684962194ec3dac9cc7590adcd4ac484339151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51F1 9772 bytes

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