Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f87647e0550f19…

MALICIOUS

PDF

78.9 KB Created: 2020-11-11 21:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 141cba5e0efb2d3036e8ade572a95aec SHA-1: e15de96c247cb6a662dbf9c542195d3657028304 SHA-256: 09f87647e0550f199db9cda365c06075b8b89c7fec559f7819b08dc133ae334f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The document body, though heavily obfuscated, suggests a lure related to a 'speed booster app'. The presence of many external PDF links and a malicious redirector indicates an attempt to lead the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=clean+master+speed+booster+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_5f8d838df20a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5f923fed43b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_5faaafa5a200d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5f9883f14cd2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_5f97795295f92.pdfIn PDF document text
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/tigetuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409250/normal_5f98b35155ec3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/90847280043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021db4e4-c2d2-49f0-a5b1-05cf3df092a5/hot_wheels_list_of_cars_all.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed87fdbc-6154-4692-a4f6-b79933103bf7/zajagu.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/pupipoliduvisobusisufiti.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/vunukixapes.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/gauntlet_legends_n64_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/80990661946.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/girolowukubebinolamepivo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6F 5148 bytes
SHA-256: 50d4f8211533b1f2bf2164e7810bfb662e5fa0753d50561e65f8b24952888b80
font_01_sfnt_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 10864 bytes
SHA-256: b02180739e5fade9773f8bbd6226a716fb1744300a515d15b83bd77d140dcbfd
font_02_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 23292 bytes
SHA-256: 3a76d6bda298ac8fe3d724c2337120cd2396a0622736b6ae12660c521095aa4b

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