Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b79628f046a6be…

MALICIOUS

PDF

82.7 KB Created: 2021-05-21 17:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a1808d0fb422d1a10d009b3c80b91c3c SHA-1: 1f934858e5bd08b9860f75e1b3e19c6d1f78ea90 SHA-256: 68b79628f046a6be0a125e4bf83838da8f7b00acee9bb6a99cad9413bba3180f
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to a known malicious redirector, dafemum.ru, which is likely used to funnel victims to malicious content or phishing pages. The ML classifier and ClamAV also flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=how+to+clean+keurig+2.0+coffee+maker+with+vinegar In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_603b251c2f160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_60556544aedb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_602aeb8333aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_60579e4e9c27c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444623/normal_5ff9d099c18ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_602001199f5be.pdfIn PDF document text
    • https://magirakikepemun.weebly.com/uploads/1/3/4/0/134000039/baleme_nugolusug_bidediniv_tusomewuj.pdfIn PDF document text
    • https://vufodasab.weebly.com/uploads/1/3/4/6/134639116/zonuzozixozokin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_601f5fb23677b.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/kolawipabifum-mafadavonefubij.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/monewudanovub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5fe0f5f0bef43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_605324118e96b.pdfIn PDF document text
    • https://vizokajobekaxa.weebly.com/uploads/1/3/0/9/130969885/xexube-tuweriwoz-ziboxobu-tofuberegixuku.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://uploads.strikinglycdn.com/files/bcc5e820-c1e7-4c2f-95c4-0144580d2f58/dexubidowezoxaf.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/what_is_a_pro_forma_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/25468126874.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/nijipamiwiwojawaxat.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/que_es_un_plan_de_marketing.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/broken_android_data_recovery_fonelab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98534460-2656-4ee9-a15c-59805d486e1a/zolurowumejusixixamediz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66dbe6b-2afc-4b1f-b2eb-2d80f68a0a79/arabic_grammar_verb_conjugation.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_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 5480 bytes
SHA-256: 5c2512f7d3160db5f5aad114f70999728b6ab4b93df7e2668eb18b6be9e28ab9
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 10648 bytes
SHA-256: 202e27c6fca22ab9018a6fa93601b750d3266d996a4029d5457831e2d2f17caf
font_02_sfnt_off00012eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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