Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa884789581e42c…

MALICIOUS

PDF

40.5 KB Created: 2020-04-08 22:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c806d6fe7674352deeb539a7534b6657 SHA-1: c6feb0976632a4bbc59193be3d7e9582f9d6a32a SHA-256: 5aa884789581e42c74b22268bd6ffd11b4887cdaf6f9897e1e8138d3908df36e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files with numeric slugs. This suggests a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs are the primary indicators of malicious activity, likely leading to further malicious content or exploitation.

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://bluelinerpc.org/uploads/1/3/1/4/131454052/131454052.html#chameleon+digestive+system
    • http://roosmarijnvandekerckhove.com/uploads/1/3/0/9/130969216/7621683.pdf
    • http://xileart.com/uploads/1/3/0/9/130970023/debivitaboxe.pdf
    • http://movoaden.org/uploads/1/3/0/6/130620390/67eb2c21135.pdf
    • http://projectbridgethegap.com/uploads/1/3/1/4/131406352/bisowaru_vazifuzab.pdf
    • http://hairnative.com/uploads/1/3/1/4/131437619/tixogefav_tuzudinemimot_vemaluzufapile_fakilixekej.pdf
    • http://zoeapothicwellness.com/uploads/1/3/1/0/131070109/rukositisag-vuxuw.pdf
    • http://bzdollars.com/uploads/1/3/0/3/130379675/4723069.pdf
    • http://nebraskafarmdog.net/uploads/1/3/0/2/130289063/tenubazilemu-donulo-turizowavixofa.pdf
    • http://myfinancialarrowbusinesses.com/uploads/1/3/0/4/130477952/vumog-vorakitevenemo-nalaxipofi-zefulodovufazun.pdf
    • http://ourchildrenmattermd.org/uploads/1/3/0/3/130379503/bojavexi_dudozalesuxi_misefe_dediwamorus.pdf
    • http://otstottdesign.com/uploads/1/3/0/3/130323984/9946984.pdf
    • http://ndhomesinc.com/uploads/1/3/0/8/130814124/tomajejumuxedis.pdf
    • http://berniergeneralconstruction.com/uploads/1/3/0/5/130589095/2280480.pdf
    • http://totalpowernj.com/uploads/1/3/1/0/131070035/3937556.pdf
    • http://master-air.com/uploads/1/3/0/4/130436339/996339.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_off000074c3.bin
85565f295eccbadef36df5a46d9556c16ccbb06756d6ea1239d59d5498bd1c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C3 7968 bytes

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