Malicious PDF — malware analysis report

Static analysis result for SHA-256 4304c1d30b1c52cf…

MALICIOUS

PDF

80.6 KB Created: 2021-05-21 20:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdc1177ed4f7809a6e4995472cfdab92 SHA-1: 88d391cbb061fbd7c48e4d0d666e14c3c6047f20 SHA-256: 4304c1d30b1c52cfb70b91cdc8c43a21e7ff38f7018c71f8bb3e95870b635e1b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL leading to a suspicious domain. ClamAV and ML classifiers also flagged the document as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristics suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://druttle.ru/strik?utm_term=baseball+star+apk+mod+unlimited+cp+free+download
    • https://cdn-cms.f-static.net/uploads/4424951/normal_605c062ad432e.pdf
    • https://static.s123-cdn-static.com/uploads/4384468/normal_5fe4efd33e750.pdf
    • https://lodufokokafapav.weebly.com/uploads/1/3/5/3/135346761/fasorolebumute_bumovak.pdf
    • https://mifeweravu.weebly.com/uploads/1/3/0/8/130874314/4357819.pdf
    • https://livabobuladezer.weebly.com/uploads/1/3/0/8/130874084/2748ad43.pdf
    • https://jatowuwovusi.weebly.com/uploads/1/3/5/9/135981640/c817fc.pdf
    • https://cdn-cms.f-static.net/uploads/4411501/normal_60522595365bb.pdf
    • https://zawiwiguxasawum.weebly.com/uploads/1/3/0/7/130739629/c4f0d31.pdf
    • https://sedogosep.weebly.com/uploads/1/3/4/4/134486754/junarax_selebekuvowas.pdf
    • https://cdn-cms.f-static.net/uploads/4389599/normal_600ff2baa7593.pdf
    • https://fabodafulunulof.weebly.com/uploads/1/3/4/3/134372089/letowuziwopaxu.pdf
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/b3f820b0089269e.pdf
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/xelemixas.pdf
    • https://polalakenasi.weebly.com/uploads/1/3/0/8/130813885/adebbfa5.pdf
    • https://zisusanizapan.weebly.com/uploads/1/3/0/7/130775047/5404081.pdf
    • https://cdn-cms.f-static.net/uploads/4419626/normal_6046249d1af3a.pdf
    • https://cdn-cms.f-static.net/uploads/4453334/normal_5fd6102064fbf.pdf
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/tixifusamep.pdf
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/9795869.pdf
    • https://static.s123-cdn-static.com/uploads/4493916/normal_5ffac8d3b9b09.pdf
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6021ceab89b24.pdf
    • https://vifoxofanope.weebly.com/uploads/1/3/4/6/134670603/pojonumililaga_zedijuvape_lupasowazal.pdf
    • https://static.s123-cdn-static.com/uploads/4367960/normal_5ff86f6c9066f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e676e3b7-f080-46af-95b6-9216bfaad409/92720128943.pdf
    • https://uploads.strikinglycdn.com/files/21bad4c5-4c2f-4126-a30c-6e32ee9c1973/77364379581.pdf
    • https://uploads.strikinglycdn.com/files/b748778c-24a1-49ab-8094-085ad47cce7d/32656044534.pdf
    • https://uploads.strikinglycdn.com/files/c956d0f5-b641-49d8-8038-b8017305de24/soundbot_sb571_review.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd8.bin
bd6eb7bf027a44843bbfd976e7cb89aab2c9dc0bd10c635285b783ff348b8842		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 5528 bytes
font_01_sfnt_off00010291.bin
17a0b6608f43b88bcef307c691311dc070f0972065cbd84cc4966ba2e19b57d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10404 bytes
font_02_sfnt_off0001262f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 4324 bytes

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