Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aa86e47d07732c…

MALICIOUS

PDF

70.0 KB Created: 2021-01-12 04:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 022f3d665a183fb8b7b67ef37d99c910 SHA-1: 631357e47147ea0973841c634720d6b0315bbc17 SHA-256: a0aa86e47d07732c3fd637f6fd4a9f1f4b9b2febe9796465628e96dfae05f0ff
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirector pattern, likely aiming to deliver a second-stage payload or phish for credentials.

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
  • 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://traffking.ru/wb?keyword=vexed%20tv%20show%20season%203 In PDF document text
    • https://site-1174278.mozfiles.com/files/1174278/steam_gift_card_media_markt.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/0802048f.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/pamolexakib.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/ijgcibm/soramanomuf.pdfIn PDF document text
    • https://site-1191111.mozfiles.com/files/1191111/pandemic_epidemic_meaning_in_bengali.pdfIn PDF document text
    • https://xogunepole.weebly.com/uploads/1/3/4/5/134529021/vetalukutokonobu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379385/normal_5fed5e864d06f.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/eG3Fhgi/chess_online_duel_friends_online_apkpure.pdfIn PDF document text
    • https://site-1168325.mozfiles.com/files/1168325/destiny_2_lunar_battlegrounds_ghost.pdfIn PDF document text
    • https://site-1171827.mozfiles.com/files/1171827/adidas_outlet_lancaster_pa_coupons.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5fdcb10e67337.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/jexewezupupugopemilo.pdfIn PDF document text
    • https://kevuwegifutawed.weebly.com/uploads/1/3/4/7/134746568/ed21380029b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 5136 bytes
SHA-256: a07f13f819470e0d2b64ebd1fd26eaadfc59fbd29f1cf7fba81715713ca9c6f5
font_01_sfnt_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 10624 bytes
SHA-256: 3262d552c10a120ce8b9e09601579fedb7f415f2485f2233941ce6221a727b94

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