Malicious PDF — malware analysis report

Static analysis result for SHA-256 16174964062303e6…

MALICIOUS

PDF

127.3 KB Created: 2021-04-19 22:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: caeb196634e021df8f403986f9866c13 SHA-1: 15961d9e134058d18de5400dae6f2f2746ce2d5f SHA-256: 16174964062303e6432b0a636bbb9e02db6ccbee5c2d53b199ba7cec65ad6d23
186 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 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://zajinet.ru/strik?utm_term=what+is+meant+by+sustainable+economic+development+give+its+main+features+class+10 PDF link annotation
    • https://cdn.sqhk.co/kevekelobivo/EXEkeia/gulazalojipa.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/c3wnhdo/10328513258.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/ickQhbZ/15138328020.pdfIn PDF document text
    • http://yandex-dostav.ru/wegunocq3xu.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/VUgdLJm/ice_hockey_striker.pdfIn PDF document text
    • http://bupedezokeromon.iblogger.org/crystallization_of_benzoic_acid.pdfIn PDF document text
    • http://natlab.ru/the_third_eye_book_sophia_stewartprknu.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/ihaZ3mu/zogorakovasiwinulime.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5febe5d0a7c1e.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/5idifja/break_bricks_with_hammer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489441/normal_5fc8b54324c11.pdfIn PDF document text
    • https://cdn.sqhk.co/nexifatogex/fRhiibH/59263073192.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/gc1CrQ1/legendary_car_driving.pdfIn PDF document text
    • http://otomail.business/81311401020a58rv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_603f60238b084.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_8b433cd7a0764f759edc2d64e188d2b4.pdf?index=trueIn PDF document text
    • http://gakinodimojulat.rf.gd/86972181653.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_f6c8c93460f345fd9cd316ead94ecf81.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_0b68e37b656446abb25554f2360961e3.pdf?index=trueIn PDF document text
    • https://9cc03a5b-da86-4a44-8f3d-15f7580f9586.filesusr.com/ugd/cac91c_907f807d94f1467cb34dd53f81cd5c34.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_91d80b138fa54080bb6116c819836a01.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_off0001b1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1BB 6080 bytes
SHA-256: fe58014c2b343add53cd5f41e0c1c4fce41f35f747f7d43525cbe2b847cf648e
font_01_sfnt_off0001c65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C65D 12116 bytes
SHA-256: 6153151fb9e879c8ba8317300a0fc69ef7bfe24fc77335268327dce95f2893d9

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