Malicious PDF — malware analysis report

Static analysis result for SHA-256 d615197d0e11ad02…

MALICIOUS

PDF

73.4 KB Created: 2021-02-12 01:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ab9482b88f3af9bb5936f49273a3cd6 SHA-1: 2da37ce6eeb01d9fee6eb936b181cd6b91d4fe55 SHA-256: d615197d0e11ad025a48f0be8ac540c738f41df1e0d207758b67062959f9ba02
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Report writing topics esl', suggesting a lure to disguise the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=report%20writing%20topics%20esl In PDF document text
    • http://antonio-ita.space/vebitupozuebxv5.pdfIn PDF document text
    • http://misstourist.info/carrera_3._2_performance_modsptega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_5fd7f6f78d310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_6013d0e6a2cc2.pdfIn PDF document text
    • http://dijawobal.iblogger.org/favok.pdfIn PDF document text
    • http://car-den.ru/bengal_tiger_telugu_movie_tamilrockers2hxys.pdfIn PDF document text
    • http://demask.space/finevobinetrjj43.pdfIn PDF document text
    • http://ehaberdevlet.com/653008635165fcm8.pdfIn PDF document text
    • http://gamedv.design/e-_gamsat_practice_test_answersjyx3p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446036/normal_600931a441e82.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/361182281315qv2n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_60197a369c7af.pdfIn PDF document text
    • http://govnosiakxws.online/ridebajikuq2t5o.pdfIn PDF document text
    • https://tefltastic.wordprIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warevaxuderisi.rf.gd/91614134411.pdfIn PDF document text
    • http://fizifar.epizy.com/aap_se_aashiqui_video_song.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 4988 bytes
SHA-256: aa55fd533080597c94e96b137091fccf62185f0d902cf3cddd55f3ed27b22d8e
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 11112 bytes
SHA-256: a7589a65c47c69f04bd4cc07db65d8185b6fc548b7cb193e071f6da69d011c0e

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