Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b27e1ed375e07b7…

MALICIOUS

PDF

72.6 KB Created: 2021-02-14 22:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 527b47d6c18e9979665c0180ae33f5ff SHA-1: a366c73d9ec9c06a5f4e3486c2c194ec3978e462 SHA-256: 3b27e1ed375e07b7ddae034636d5847b3d56e2b7959f7ff44e4d2e11236217cd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URL, 'https://crophysi.ru/aws?utm_term=2d+game+engine+for+android', is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/aws?utm_term=2d+game+engine+for+android In PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/844aa076.pdfIn PDF document text
    • https://cdn.sqhk.co/liralimujote/ijZghhL/brawl_troopers_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fcaf1be21e8f.pdfIn PDF document text
    • https://xudemogarutigi.weebly.com/uploads/1/3/4/7/134733212/logubezixuk.pdfIn PDF document text
    • https://fiwudarive.weebly.com/uploads/1/3/0/7/130775392/duzupodomupuj_pilugonod_xesuxuja_xemaje.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/sjaKij8/emulator_for_ps1.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/idjifhh/minecraft_pe_elemental_creepers_mod_download.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/wulojikugeladabaj.pdfIn PDF document text
    • https://zobaretax.weebly.com/uploads/1/3/1/4/131482953/82e849b9557c.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusonitid/cZejbY4/nabasozulezamik.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
    • https://s3.amazonaws.com/tazopaju/math_double_digit_addition_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/chemical_kinetics_questions_and_answers.pdfIn PDF document text
    • http://patuwovoparivi.rf.gd/nizamijevomulabivagesutu.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/93880609455.pdfIn PDF document text
    • http://suwulinivez.rf.gd/zibuwugiparevit.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/room_rent_agreement_format_in_marathi_word.pdfIn PDF document text
    • http://tuzivapevof.epizy.com/wakexonalinav.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/bozebubojomilabanuritojop.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_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 4760 bytes
SHA-256: 51407087ac35e173bcc94b5f7ce11297280b508b0bed816f9781afbbdaf140a9
font_01_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 9632 bytes
SHA-256: a3376acdba7211c8fa73027272716760e9fed75bf50a9a18a2c7dc9520aa6b79
font_02_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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