Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f187183bbd3cb76…

MALICIOUS

PDF

80.5 KB Created: 2021-03-09 00:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1a13bfc8c06b64ed60eb86ad705f5560 SHA-1: b6539a426828f1ed95cbf17132478b50ec2de055 SHA-256: 6f187183bbd3cb7611c644a1ae7cadb8e932da30eadd91acb6d42d3a84949248
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily corrupted, suggests a lure related to a 'video converter android app', indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://leonvi.ru/123?utm_term=video+converter+android+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475376/normal_601cf02f4a63a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_600b1c93a33fa.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/hjbhd85/buzzer_beater_anime_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5fcbdf1cec91e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369166/normal_5ff56973c8841.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/rhaqllh/49215937225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_603e33d3efae5.pdfIn PDF document text
    • http://mikapamaku.22web.org/66020279175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445341/normal_5ff637cd3aba2.pdfIn PDF document text
    • https://cdn.sqhk.co/faxiwapa/SCtnBhA/ferivakezewiv.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/M8jjugh/zapefepodetipit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368467/normal_5fd07ff1a6ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_6010703d6fda2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9e4730b0-05f5-4abf-b3c2-37540f6272e2/zifutadegarirakupofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd735e4-d1e6-4afa-9678-99ec8ce8f223/why_is_act_2_scene_2_important_in_macbeth.pdfIn PDF document text
    • http://fasujenijasezos.rf.gd/blood_pressure_machine_digital_or_manual.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_b558e7dd98cf48b39c2ecb5c83185a94.pdf?index=trueIn PDF document text
    • http://jisavimi.rf.gd/22173859807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256f6c2a-efa3-4b4b-80df-bdb81760cebf/reruvivuzogonabul.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_dc6a41cd869f47b79287365ce87d61ac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 4672 bytes
SHA-256: d7c6a890cf04582492494f2375ebaa46f668d6f9fd9ae9136b294433007d5625
font_01_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 10716 bytes
SHA-256: 41475e6efcdfa88cd0f0a96026488bc30519c23d6e2029c7a2a8d27dc2bf489b
font_02_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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