Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bd57f0481ca75e…

MALICIOUS

PDF

84.9 KB Created: 2020-11-11 22:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1d5657545048623f3f3898b9633dbdf3 SHA-1: df8c9cec7e68cbcbc85e86dc08adf9e6bf97b294 SHA-256: 53bd57f0481ca75e2ff89a057965c510882ff0e6db5815284d95fafce37fc181
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://trafffe.ru/123?utm_term=call+of+duty+world+at+war+mods+zombies PDF link annotation
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/8dc8aaf8dbd.pdfIn PDF document text
    • https://poraduke.weebly.com/uploads/1/3/4/3/134385775/tijivirave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_5fa7c22c01645.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/f85d435f-0c35-42ec-9707-3b15013a452a/gitimisunipokukobiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9141fa8-649a-4525-bacf-c5642967c7bc/shadow_fight_3_cheat_engine.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/pictures_of_houses_in_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171a78cc-ce4b-46e7-82eb-40211355f199/39815940994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c9af591-d890-43de-a39f-3f833acba5a1/godadumenojozaxen.pdfIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/63532698214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8416d9b-25dc-40e7-849c-792eb7f82bbd/kingsman_the_golden_circle_english_s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555c91b4-97f5-43df-877f-904ccb5aecfd/manual_sprayer_controls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dbb5df-c49f-4205-a491-f657faf21f73/8698928404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d921222-8f95-4da0-ac0d-a5cdbaf4f8ff/detoponedutofemirod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40fa75f-bdf1-4824-bf2d-d8a2978c7856/42070179347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f1fb3c-7919-4423-924b-be69336c1eca/gerupizozugul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 5236 bytes
SHA-256: 4be7be45c908fdeaf53ecb1924f61c5232ccd7436d3dd7f7c33d272b8c980428
font_01_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 10604 bytes
SHA-256: fa2df86b833b844bec7b7871f0ba20df0ca11c0d8d656ac4c5125c3524f27181
font_02_sfnt_off0001380a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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