Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb7d8e53b6b4cb7…

MALICIOUS

PDF

42.0 KB Created: 2020-05-07 04:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: efcaac0e0c27a87b4b2df3e9ae2679d7 SHA-1: 3e37e6c99afd30f223c7e5fcb5fa438018de672a SHA-256: dbb7d8e53b6b4cb71e494b5d4c7704049867048ec4f3294f91f61105a960af67
94 Risk Score

Malware Insights

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

The PDF document contains a deceptive lure related to an online application form, which is a common tactic for phishing or malware distribution. It embeds a significant number of external links, many of which point to other PDF files, suggesting a link farm designed to obscure the ultimate malicious destination or to host multiple malicious payloads. The ML classifier strongly indicated maliciousness, supporting the interpretation of this document as a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://onelovegodslove.com/uploads/1/3/0/4/130476068/130476068.html#online+application+form+of+panjab+university+chandigarh
    • http://ellanah.com/uploads/1/3/0/4/130476085/f3308.pdf
    • http://cliftontaxicabs.com/uploads/1/3/1/4/131452983/6788391.pdf
    • http://atlpeepingtom.com/uploads/1/3/1/8/131871414/zoxenivelegejuk.pdf
    • http://vosfurniture.com/uploads/1/3/0/2/130272295/lukede.pdf
    • http://celestedesales.com/uploads/1/3/0/6/130604411/fiwogazas-rimapobuxi-kunadaxagawod-mesez.pdf
    • http://ineedahomeplease.org/uploads/1/3/0/4/130435553/jawubuzilure.pdf
    • http://alanajaneskincare.com/uploads/1/3/1/1/131164171/razatisagikoz_fivamepej_tevivi_nebagasewurur.pdf
    • http://zucht-niesenblick.ch/uploads/1/3/0/5/130539059/1019484.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off000079cc.bin
83597da67dc0dc2bd9434d92ece2a4df0a64c04ddeff1863f5d2b2b0f95bfa76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CC 10760 bytes

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