Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc55a170fbe8a56…

MALICIOUS

PDF

74.1 KB Created: 2021-05-23 22:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9890dd70c6113ce2877c15b46153fa5d SHA-1: 5939a1f3d12e1a0dfd120f429b0271013bb66869 SHA-256: 7fc55a170fbe8a5604e17e5efa98faaf320a2139464d80100599caa79615ec4b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to generate traffic or SEO benefits. Crucially, it also fires SE_SECURITY_BYPASS, instructing the user to disable security software. This, combined with the ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to trick the user into lowering their defenses. The embedded URL points to a suspicious domain, likely a staging point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://golowaki.ru/strik?utm_term=why+is+my+cox+modem+blinking+blue PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418973/normal_6048c15a12d2b.pdfIn PDF document text
    • https://pekudexuvu.weebly.com/uploads/1/3/1/4/131437333/f0f6b677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448548/normal_605a1e6d590e6.pdfIn PDF document text
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/nuzos-vojireleb-xoxajufadetib-vusoguwezot.pdfIn PDF document text
    • https://xabesokexiba.weebly.com/uploads/1/3/4/3/134327988/9966361.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20d12bc-3a5d-492d-a620-99dfd5e0463b/how_much_are_martial_arts_classes_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/guideboard_road_clifton_park_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e24c28-2df6-4baf-b04c-7b58d18123ed/livugo.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/aarambam_video_songs_mp4_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/remopi.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/how_to_pair_jlab_epic_air_bluetooth_headphones.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/96002809430.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/29026008488.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/20_facts_about_jamaica_kincaid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b3443b-93cb-48e9-86b9-7577dc38b61f/48342870517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3651599a-cef5-43f8-9c98-7a7afe3468e8/skyrim_ps4_mod_load_order_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/mendeley_referencing_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b98977-dea0-4a49-a1ba-a9ca0383eaac/88367678356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84584e38-0bd2-4d69-b68e-1d132f8dcbb8/wijebexugugobi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 5432 bytes
SHA-256: 3675be73649417870fcc65937c4e948dda89f7758509ff2df1b918f8f215f6bd
font_01_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 11060 bytes
SHA-256: 9c457a456b5dbf8e010ec28b46a05e58ecd481971126b706c9461c42c4d4b9be

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