Malicious PDF — malware analysis report

Static analysis result for SHA-256 312f2fcb489f4ec8…

MALICIOUS

PDF

78.1 KB Created: 2021-05-22 18:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a80136627a6090feb1582ac024f99c5d SHA-1: b8899b9ba1d534db8c5c5ddf54f0e321b0936e2c SHA-256: 312f2fcb489f4ec8a02e956414a6278411935884cba4d4b2c9ab54ba4e37dc1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic indicating it's a link farm, with numerous external PDF links, one of which is a suspicious URL related to 'netflix net help code'. ClamAV also detected it as a phishing trojan. While no scripts were explicitly extracted, the presence of external links and the nature of the detected threat suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://seumenha.ru/strik?utm_term=netflix+net+help+code+ui-800-3
    • https://cdn-cms.f-static.net/uploads/4487888/normal_6068d80ad67fe.pdf
    • https://cdn-cms.f-static.net/uploads/4411681/normal_6025dd4799991.pdf
    • https://cdn-cms.f-static.net/uploads/4370066/normal_603cfebbe40c0.pdf
    • https://cdn-cms.f-static.net/uploads/4455876/normal_6050c3b6e24fe.pdf
    • https://static.s123-cdn-static.com/uploads/4415946/normal_60074ebc10870.pdf
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/gasomemawevinemokub.pdf
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5fe7e20773e10.pdf
    • https://static.s123-cdn-static.com/uploads/4486060/normal_5fe3a484c2ff0.pdf
    • https://vofirojaj.weebly.com/uploads/1/3/1/6/131637635/503d10cf6.pdf
    • https://cdn-cms.f-static.net/uploads/4450728/normal_6066c69aae73d.pdf
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5ff946a1d30b5.pdf
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/dofok-rulipu-funukikimexi.pdf
    • https://cdn-cms.f-static.net/uploads/4378599/normal_603316cfaf999.pdf
    • https://cdn-cms.f-static.net/uploads/4369909/normal_601abd27737f8.pdf
    • https://cdn-cms.f-static.net/uploads/4410443/normal_604ca55d97bf8.pdf
    • https://cdn-cms.f-static.net/uploads/4392215/normal_6017a156aad9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/davolazupivowi/salon_gift_certificate_template_free_printable.pdf
    • https://s3.amazonaws.com/wonumafubij/58344991442.pdf
    • https://s3.amazonaws.com/tajimipojimo/chori_goriye_banjara_song_dj_remix.pdf
    • https://s3.amazonaws.com/wiwuxot/axial_scx10_2_kit.pdf
    • https://s3.amazonaws.com/bubeto/speaking_ielts.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea51.bin
cceb43ebe11f8ad3777182a5eeab09eb23840dd09e222dc446cec356b7dd0336		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 5328 bytes
font_01_sfnt_off0000fc92.bin
e8740688b2eedaa7694d659c4307dbd15d36f0eb75902d9550b2e6143ad74710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 15120 bytes

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