Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd284c1d9f8753d…

MALICIOUS

PDF

74.9 KB Created: 2021-03-29 14:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a5e8b1fc559622a1fad1c5d4f5320ee4 SHA-1: 92e4cc680b0438e01e26ab8d4751244a6587f003 SHA-256: ccd284c1d9f8753d849c2b53fb4b66d7c613eb8d93a270b89f980bc2019ee3e6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to drive traffic. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/award?keyword=apparel+manufacturing+sewn+product+analysis+pdf PDF link annotation
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/vojesurozilevafegik.pdfIn PDF document text
    • http://pawelemofub.iblogger.org/car_air_conditioning_fan_not_working.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/zarupiviso-xaxoja.pdfIn PDF document text
    • http://xifamopituwoti.iblogger.org/vigujavidofededo.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/4886250.pdfIn PDF document text
    • http://gavixed.iblogger.org/42438654870.pdfIn PDF document text
    • https://xudufuzed.weebly.com/uploads/1/3/0/8/130815664/tobekovizujeke_kabawutojobep.pdfIn PDF document text
    • http://pozonewexoz.iblogger.org/how_to_do_resistance_exercise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bawofifudip.rf.gd/what_is_marxist_criticism_in_literature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1ce783-aa78-462e-8c04-4908f13b63fd/which_electric_skillet_is_best.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_46e58513295445c6bfc3f59b07e5612f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb035284-cc8d-4e9e-aab3-df0eb0f1eda5/what_is_the_best_bread_machine_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b1b98e-3dae-43da-8102-f70638eb51ae/19968129600.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_c417f340c5564c37bc2fdf29af645155.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_0673063d87b04295bd1c6fd74481d609.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/950cdf9f-1fe0-4ec2-9331-da76ee132692/bonexuralitiwuso.pdfIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_6bcfa298439b4493a94053da31030563.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_4e71e1f361ca4837a1c11e9028425067.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda63a42-336e-4025-8221-8a57d72edfef/fukaxizevodurujako.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_f424f62ffa62458ea3cad65ef31fc999.pdf?index=trueIn 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_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 5660 bytes
SHA-256: 0f4953223597d47e0eb71e0adc5bcf4c7e5943ee0a33b02afe025de0cc022445
font_01_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 10124 bytes
SHA-256: 1b21c405c622bc3850267ccbdf0d68008045b38662862c6084e1fc52cc3af88d