Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fb1d6538cfdccd…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 11:34:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c629f335696becbff651bbe9eae9fcf7 SHA-1: 6b482469d26cc8b6cbb4b9ea5dbec6a8b9dfcfdb SHA-256: 24fb1d6538cfdccd0a174421157f12719a97061648baeadfc5f1f3938c7f746e
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. It contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector at 'dafemum.ru'. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct users to malicious sites. No scripts were extracted, but the overall structure and link farm behavior are indicative of a phishing or malware delivery 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/award?keyword=cutting+practice+pdf+free In PDF document text
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/pigare-fovufusotow-bepominowi-wedigoral.pdfIn PDF document text
    • https://rokajovata.weebly.com/uploads/1/3/4/3/134376264/4f8dbd0.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/2728522.pdfIn PDF document text
    • https://gugekeki.weebly.com/uploads/1/3/4/3/134374678/6012465.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/327c0f2a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451932/normal_5fde6909896b5.pdfIn PDF document text
    • https://biwojifagape.weebly.com/uploads/1/3/1/3/131381518/jetusefibuzisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_6016fe524549f.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/lujijuxeratewedasozi.pdfIn PDF document text
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/5222492.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://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_1f8b3a6a5c8d4442a7d84a980296548b.pdf?index=trueIn PDF document text
    • http://dujizadixupodur.epizy.com/mbti_personality_type_test.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/how_to_grow_iceberg_lettuce_from_seeds.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/screwtape_letters_quotes_busy.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_1ea7ba8ec61447a5b3d2f462802282af.pdf?index=trueIn PDF document text
    • http://kukuvil.epizy.com/redemption_accomplished_and_applied_ebook.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_9d91b01a19ca4b0593f3da8316d9aedf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nigimul/vogurepiwawurixonanonu.pdfIn PDF document text
    • http://karedewig.epizy.com/dopenijatetubazatibisav.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/whirlpool_ice_dispenser_not_working_but_water_dispenser_is.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_450d1477c8a746da9fff97fbe335e80a.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_a3d72197fe964076b2cc682ee8a50a4c.pdf?index=trueIn 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_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 4908 bytes
SHA-256: 970829b323e3357245a48dff883671226f6e1f5f158de243c976a5745822f38e
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 11084 bytes
SHA-256: 0ad5640c595931bb49182d71e9aabd254619fa8f2b98c472de43b492be020937
font_02_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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