Malicious PDF — malware analysis report

Static analysis result for SHA-256 64eb1df6431d2b1c…

MALICIOUS

PDF

70.8 KB Created: 2021-06-09 03:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d09ba854f6724820456b587417edd35a SHA-1: 049f82c917de7c0311bc2404f4e937ad06bd5321 SHA-256: 64eb1df6431d2b1cdd9bbc2ae9501c46bcd74a5e09eec411a684acac0e044d7a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely phishing or spam campaign. The document body is heavily obfuscated and contains what appears to be junk data, but the presence of external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cructi.ru/pbw?utm_term=porn+new+style PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465252/normal_603cee9ecdfed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418786/normal_602e1a0aae9e4.pdfIn PDF document text
    • https://xovamiwif.weebly.com/uploads/1/3/4/0/134096018/8644918.pdfIn PDF document text
    • https://xaberekulokoka.weebly.com/uploads/1/3/1/8/131856377/7846849.pdfIn PDF document text
    • https://dalupapixoriwu.weebly.com/uploads/1/3/1/4/131438121/8b0a6600f9.pdfIn PDF document text
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/tunowowizip.pdfIn PDF document text
    • https://sozakipebi.weebly.com/uploads/1/3/0/8/130814717/pirana_jogibexa_vivibudadamiru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444353/normal_60039b1acfa81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fca79f7dd885.pdfIn PDF document text
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/5071845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464541/normal_5feb215cd41f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501229/normal_60411e78a2284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_6051146f82c5e.pdfIn PDF document text
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/juvagukisoxemizomi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403414/normal_5ff3eb9ba81c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3a6291-15fb-4a21-93d5-4cc05559f6cd/95161301357.pdfIn PDF document text
    • http://feselikebapu.pbworks.com/f/10216511256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f397c831-535b-429c-b655-adc2403ac917/kibujonutunufupifaji.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/winabazezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7dd7ed-fe1d-4e74-b418-68a1a6d3e455/catch_me_if_you_can_trailer_youtube.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/w/file/fetch/144445266/lizajorigokofunozasabara.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/recep_ivedik_3_full_izle_filmci_baba.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 4664 bytes
SHA-256: 2969fcd00c688d9ece43256c6900a385fd3bbbae3469d20a08179dd80f54cd96
font_01_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 10476 bytes
SHA-256: 1488120b4f8814702d32e458895a1df41b8acf72f49491d89a8882076292c0e2

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