Malicious PDF — malware analysis report

Static analysis result for SHA-256 c079f2a54bb2587e…

MALICIOUS

PDF

75.4 KB Created: 2021-03-10 17:13:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d84c4334bf7cd85a5fa5104e031f9d1c SHA-1: b64cbebf770a6258dded3f0425ebb816a867eda6 SHA-256: c079f2a54bb2587eb695b039d7074edae3dcd36eb346e69a61288d0d612ced6f
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, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'inspirational corporate ambient music' and the wkhtmltopdf tool, which is likely a lure to disguise the malicious intent.

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://maypoin.ru/123?utm_term=inspirational+corporate+ambient+music PDF link annotation
    • https://cdn.sqhk.co/wuwovodegi/ghia58i/word_collect_answers_level_2005.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/ZFibYhh/mod_master_for_minecraft_pe_apk_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5fd7674f91c57.pdfIn PDF document text
    • http://goods-amzon.com/gamespot_cyberpunk_2077_review_controversyb60lr.pdfIn PDF document text
    • http://polypak.site/10185198315d1xq2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370275/normal_6005022e9860f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_6041a06343b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_603c3551767fa.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/fibewuwusapif_lanaxosedukota_tawasisanukera.pdfIn PDF document text
    • http://vash-komfort5.ru/chennai_gana_song_harish_video9t78f.pdfIn PDF document text
    • http://sungo1.space/bivapetid70grk.pdfIn PDF document text
    • http://hargotel.xyz/dcp-7065dn_drum_unitg14o3.pdfIn PDF document text
    • http://libertinemodels.com/how_to_write_a_synthesis_essay_ap_langg82t1.pdfIn PDF document text
    • http://molotkov.site/fukukagolerefopufizugokuobzv8.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/wirase.pdfIn PDF document text
    • https://cdn.sqhk.co/sozivowemin/ibgfTjd/ronin_warriors_armor_of_wildfire.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/c5f17d542d95.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/vinubekutagemex_jiterupojagef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_600c81bd17dae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_1e90930eab5d40a2aceb0b27916964b4.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_087665d67f6843c99d61bfa80581a90b.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_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 5156 bytes
SHA-256: 145e1bdb50697f7abbae21c5137c2cefc9a557932bba5114f0ce472079fcd359
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 10828 bytes
SHA-256: ec061a6f4cf8192fcdd67de67300173cdf01006019fcdef80342f70dcdbd41f1

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