Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0b5f18b86945ce…

MALICIOUS

PDF

72.3 KB Created: 2021-03-19 18:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74262ab38b14f09e4df382acbaff4082 SHA-1: 51869a185a05c75d08680df55f9f8b2a3eb1b6a4 SHA-256: 9a0b5f18b86945ce509cab122571392ada98b73b6232c2f4887cace0177204d3
164 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/wix?keyword=codingbat+answers+recursion+1+count7
    • http://sipedimoxikidox.iblogger.org/business_english_conversation_example.pdf
    • http://jepaxikunaku.iblogger.org/zetenidanebuwifalujeb.pdf
    • https://cdn-cms.f-static.net/uploads/4482629/normal_5fe864bc60ee8.pdf
    • https://cdn-cms.f-static.net/uploads/4450511/normal_600b62d814f85.pdf
    • http://fuzoronib.22web.org/boforazib.pdf
    • http://pusaburuku.22web.org/bejalegodelosazijite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_b78f716dd4e7475fa27a001e328ac3c2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/09d3c768-f0d7-43f0-aa5b-8380435b1a67/mewakofapavefelojajexuka.pdf
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_632f8f13c1a54740a6a35538d951a06a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f8a397e-64d5-4fc5-959e-a4e2be2126a1/razolon.pdf
    • https://uploads.strikinglycdn.com/files/84d2c3a0-edae-4788-8aac-0b1e886f1e02/fitifixesuropoturarap.pdf
    • http://sumawimibodi.rf.gd/bacteria_structure_and_function_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/b80dca3a-f390-4da2-bd0f-284d02056e62/jokoxoxu.pdf
    • https://uploads.strikinglycdn.com/files/dc3d1d75-e7fb-4800-bf51-dc3aa286ade0/mercury_9.9_hp_4_stroke_oil_change.pdf
    • https://s3.amazonaws.com/toliwudalamem/radonawebutijibudabuvupaz.pdf
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_4b72a1af4165444da052ff4df217bf9e.pdf?index=true
    • https://s3.amazonaws.com/kudufigunabi/alejo_olorun_1.pdf
    • https://s3.amazonaws.com/mejifavo/bazadusijigewaxuteb.pdf
    • https://s3.amazonaws.com/bofake/30893508552.pdf
    • https://uploads.strikinglycdn.com/files/e61a6b25-19f1-4869-ad74-27daafadc959/42623960254.pdf
    • https://s3.amazonaws.com/kavalukato/xajuwupusazal.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_off0000da55.bin
06de53d62a004657b58d5166aba14e186fac9848ed8a17d94a49e206d8897d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 5344 bytes
font_01_sfnt_off0000eca7.bin
c4201bdf675cf352309f984c7e128d51d0077a54e05fee8db621c6450d083c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 11464 bytes

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