Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8fca3a14f4b36c…

MALICIOUS

PDF

89.6 KB Created: 2021-03-28 19:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9eaf8eb412c2d2d0bb19346257fa994 SHA-1: 907332bb2bccd5b91a0ad1cb0fb6c085c4ae528e SHA-256: 7d8fca3a14f4b36c2e30f04cb1e9be5ca4ea9e6d123676f068a5efb7e89d19a7
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, which is a common technique for SEO manipulation or distributing malicious content. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=flame+test+conclusion+and+evaluation
    • http://xviiivbgz.com/warfare_1944_unblocked_hackeditxdv.pdf
    • http://mantenancie.com/me_before_you_trailer_339fmi.pdf
    • http://odebayitrafikhizmeti.com/86498655613d3fwj.pdf
    • https://xajadigosulibab.weebly.com/uploads/1/3/4/6/134650053/5752892.pdf
    • https://lanulizuxuja.weebly.com/uploads/1/3/4/6/134658029/1160772.pdf
    • https://dunegigamirusa.weebly.com/uploads/1/3/1/4/131437715/96c5569308d1.pdf
    • http://bolawixefop.mygamesonline.org/cerita_alkitab_anak.pdf
    • http://sutivetowit.mypressonline.com/lego_harry_potter_5-7_codes_pc.pdf
    • http://keep-travel.com/cursive_handwriting_practice_worksheet47itw.pdf
    • http://tajuliwelofiti.medianewsonline.com/nasasebumox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_2ce23e09bc5f4ae38041c460c383bde7.pdf?index=true
    • http://pavabiza.atwebpages.com/74785014714.pdf
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_10f6005cfffa40698cda77ed005689e0.pdf?index=true
    • https://c11ab09e-384c-4904-8c79-5ef6f38008df.filesusr.com/ugd/7131a6_90037b66901a45f19bde4149b352d701.pdf?index=true
    • http://revudipepofaten.myartsonline.com/grade_2_ac_separation_healing_time.pdf
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_416b456b963d4d81811edd2a273ef496.pdf?index=true
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_e99ee45772d74f01aec66d2c0eeaa0c9.pdf?index=true
    • 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_off00012025.bin
a46f1d00643fc407d34060338edb71e466b1643c054ba8ef1bd0da4f48d96856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 5004 bytes
font_01_sfnt_off00013121.bin
b2c7eef0a212c92c1e5a57b581f447a266182fce571e8c064191d48d995215f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13121 11852 bytes

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