Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe850cdb37d981ff…

MALICIOUS

PDF

40.6 KB Created: 2020-05-14 20:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca1a9c8b6ef2ffdaa6bdf9a9bd450145 SHA-1: 5dd3f9f3efcebb91c2d2048457eab9161de13432 SHA-256: fe850cdb37d981ffd2ee02cab695226ad9ce60586cec8d8c7acf388ccbadaee7
94 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, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'Banditry in nigeria' and includes several of these external URLs. The ML classifier strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to direct users to a large number of other PDF documents hosted across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://saraventures.net/uploads/1/3/0/6/130621912/130621912.html#banditry+in+nigeria%252F+pdf
    • http://volunteerawnings.com/uploads/1/3/1/1/131163865/sewafuda.pdf
    • http://operationredthread.org/uploads/1/3/0/5/130590511/guduxovalepurok.pdf
    • http://islanderwool.com/uploads/1/3/1/3/131398452/mepaniwosufomof.pdf
    • http://aplusqualityhomes.com/uploads/1/3/1/0/131069860/1397123.pdf
    • http://raindropcapital.net/uploads/1/3/0/5/130590224/b79d326e.pdf
    • http://ohiomoboil.com/uploads/1/3/0/2/130287862/rifitif-pabige-soxokedad.pdf
    • http://nasseralkhalifa.com/uploads/1/3/0/8/130873975/9430683.pdf
    • http://angusmowry.me/uploads/1/3/0/7/130739621/xisadokidimafot_ditefuvategedi_gotezaramu_potolakavin.pdf
    • http://newhorizoncouncil.com/uploads/1/3/1/6/131636980/6c1fc7eead6.pdf
    • http://jdaei.com/uploads/1/3/1/3/131380485/2869745.pdf
    • http://missrkiernan.com/uploads/1/3/0/6/130604938/dirozelom_mijeneru.pdf
    • http://gnlogisticsservices.com/uploads/1/3/0/5/130540065/9623989.pdf
    • http://enkidimata.com/uploads/1/3/0/4/130476573/8651811.pdf
    • http://bemisfarms.com/uploads/1/3/0/6/130621194/6845820.pdf
    • http://terraplena.us/uploads/1/3/1/6/131606434/8662310.pdf
    • http://charlottefirealarm.com/uploads/1/3/0/6/130620282/lidajori.pdf
    • http://japanesespitznz.com/uploads/1/3/0/7/130775892/3428677.pdf
    • http://irl-moms.com/uploads/1/3/0/3/130379049/mukawiko-rugufuxujeji-tufokaleleg.pdf
    • http://azizselman.com/uploads/1/3/0/3/130313400/831ed63af.pdf
    • http://32southapparel.com/uploads/1/3/1/4/131408209/65636.pdf
    • http://islnd.store/uploads/1/3/0/5/130543210/jajanu.pdf
    • http://knownoesis.com/uploads/1/3/0/9/130969037/nokub_nikomi.pdf
    • http://goldenerstern-nuernberg.de/uploads/1/3/0/7/130739910/577fde2172.pdf
    • http://valleystreaming.com/uploads/1/3/0/3/130323285/daxedodufumewujeval.pdf
    • http://the1060project.com/uploads/1/3/0/2/130274267/dimatunub_gatetamamapuw_kexus.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_off000071d1.bin
7f462149ad4e6168e82139b1a71b5252191b86474262e97679dffb549469d6a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D1 10684 bytes

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