Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55dc073943302ec…

MALICIOUS

PDF

83.2 KB Created: 2021-04-23 21:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 42f03b3072dbd675a748de24ef54b0c0 SHA-1: 03f7da8c96a9d565a3805685244d186ec269240e SHA-256: f55dc073943302ec73d12baa23dde82e8d857263bdf3086efe4eaafe3fe5e3d9
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 embedded URLs pointing to disposable hosting and link farms, a common technique for phishing and malware distribution. The document body, though heavily corrupted, suggests a lure related to 'La iliada', likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=la+iliada+pdf+resumen+por+cantos PDF link annotation
    • https://cdn.sqhk.co/vapumojemov/heiigeh/44623084489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450504/normal_60563ebe34d5d.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/zazozuzeluja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380540/normal_5fe39137c55c2.pdfIn PDF document text
    • http://varakeno.iblogger.org/19598325543.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/cNijkv8/virtual_villagers_origins_2_walkthrough_puzzles_10.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/SwyRjcS/cross_stitching_letters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421336/normal_5fe33b4f0645d.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/xiwesa.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/5a6f9b8e.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/hjh1Ghd/xetuferugitofewujabukape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_5fd8d478dc0ee.pdfIn PDF document text
    • http://raftgjgr.space/killer_bean_unleashed_hacked_apk_free_downloaddax67.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/nXU3Hgh/truth_or_dare_questions_for_friends_in_tamil.pdfIn PDF document text
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/7760862.pdfIn PDF document text
    • http://merishwheelrecords.com/68272072701w5ql8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xufivutuxalug.rf.gd/xgboost_tuning_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 5240 bytes
SHA-256: 1ef6136c11aceb4875af7df73564495232d9dfd3f6c39512c486d03997f51a22
font_01_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 11972 bytes
SHA-256: b439faf46f9f228073aba284d57194bba36ae187b7099529ff848b0f33295cb3
font_02_sfnt_off000128ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 16144 bytes
SHA-256: 89fb4cb0e03d0651222735942ed00a203783669e61652b29c0ae4e378b8446a7

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