Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ef168746359031…

MALICIOUS

PDF

77.6 KB Created: 2021-02-21 20:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 981063dad9370464f6152a1114264013 SHA-1: ff55489bb97784e22496e4280dd3a1b355760f68 SHA-256: e3ef168746359031b5e4a16fb6edc6b59340bc327847394ca5c87721cbee38f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with one pointing to a link farm designed for SEO purposes, likely a lure to distribute further malicious content. The presence of external URIs and the ML classification strongly suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=crm+exam+questions+and+answers PDF link annotation
    • http://tadenexibegujam.22web.org/banjo_music_video.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/3d_max_2018_vray.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/4067fd30d149cbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_5fd672b60238c.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
    • http://luxelifop.epizy.com/eternal_city_all_ending_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/android_black_market_apk_2012_free.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/livro_sobre_o_autismo.pdfIn PDF document text
    • http://lalemifeluruka.epizy.com/mandated_reporter_guidelines_illinois.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/cuanto_tiempo_tarda_en_desinflamar_despues_de_una_lipo.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/96226047894.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/gimp_mask_with_zipper_mouth.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/vs_code_beautify_format_on_save.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_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 5128 bytes
SHA-256: 20ff24962e8deda29834f10967f63a747015adbc6238060ae57f2a0651eb468a
font_01_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 11208 bytes
SHA-256: fbe8441d32ac0f5f485e3e9b8b3ee12a9b17d10ed32df62b6bf0ba737ec11ca5
font_02_sfnt_off00011b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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