Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca1f564a3cf5bc3…

MALICIOUS

PDF

74.9 KB Created: 2021-02-20 20:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b426f925e0d1b9b3bc5f617c78bbcc31 SHA-1: 4b084d7251dbca173f99a7cd892698c1429f26f5 SHA-256: bca1f564a3cf5bc35964943558e97bdf09631c4d2f6ac723e61cd8e7bd4ca19e
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded links, including one pointing to a known malicious redirector at 'https://yafferge.ru/strik?utm_term=phone+says+line+in+use+no+dial+tone'. The presence of many links on disposable hosting suggests a phishing or malware distribution campaign. No scripts were extracted from this sample.

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://yafferge.ru/strik?utm_term=phone+says+line+in+use+no+dial+tone In PDF document text
    • https://cdn.sqhk.co/gobisofokox/dDKQS26/off_road_racing_adventure_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_602b68d0d427c.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/bimuruz.pdfIn PDF document text
    • https://mewurotimopu.weebly.com/uploads/1/3/1/3/131381658/5620245.pdfIn PDF document text
    • https://jufufowepum.weebly.com/uploads/1/3/5/3/135348100/4327503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_6027825e71497.pdfIn PDF document text
    • https://cdn.sqhk.co/wusirilunoko/qidEVgx/last_event_app.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/hHcFxVE/notadozaju.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/2b67960287.pdfIn PDF document text
    • https://mavevataxivira.weebly.com/uploads/1/3/4/6/134600118/tuzebuleroris.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/yjHpXgd/rainway_roblox_power_simulator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd63d7a7b24d.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/Lichfgc/tofuwujawinefelisujox.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/zopuzurom-judejizeluxa-fudofunoxexe.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/takinurinusufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496402/normal_5fc8365887c28.pdfIn PDF document text
    • https://pogugabumivo.weebly.com/uploads/1/3/1/3/131381840/xaduxabisuximek.pdfIn PDF document text
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/zusinetiwobe-miwiva-wodiniwidav-dolizomapal.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_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 4920 bytes
SHA-256: cb342e462c2211e7129cdeb7ae04fa7a634c99bfc5cf8b5e7a183b3d68014c17
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 10588 bytes
SHA-256: a7c1d6915b284bedb112d58946953201064999dea54a0557b3a645398d9cd26e

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