Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4b05a415f4cd11…

MALICIOUS

PDF

96.8 KB Created: 2021-03-18 08:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3eb27814f18c036500254893fb4654b5 SHA-1: 1884ed9eb98d9416a2ca5507298498611554b3ed SHA-256: ab4b05a415f4cd11169291bda77325592766df582c647fc2f65fe2e340bb185e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=what+oil+does+a+2004+dodge+ram+1500+take PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366652/normal_6037fc46bed9b.pdfIn PDF document text
    • http://english-10.site/safufusekagojuwimilomotikvyw54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5fe75d9964971.pdfIn PDF document text
    • http://secureappeal.com/nefuxunawejofasanefexiz1n.pdfIn PDF document text
    • http://dokusamatofapig.iblogger.org/hewlett_packard_10bii_calculator.pdfIn PDF document text
    • http://vibigalobonewil.iblogger.org/why_is_there_water_in_the_bottom_of_my_ge_dishwasher.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/3932730283.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/76014448056.pdfIn PDF document text
    • http://stikc.xyz/xuxuvunujevi14gjz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_600b55265c2ff.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/69808298172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_5fe69521e4543.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/74329d39-7846-4cb0-8aea-470fa200487c/wigire.pdfIn PDF document text
    • http://zijurape.atwebpages.com/antonyms_in_english_grammar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e59839-774a-4ce1-8b02-6f40dada9a0f/where_are_beets_grown_in_ontario.pdfIn PDF document text
    • http://repefewuvu.epizy.com/zekum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a651376-df69-4f8f-a22e-99be727f8d8d/jesedelorobonazijase.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/pradhan_mantri_awas_yojana_list_2020_west_bengal.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_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 5536 bytes
SHA-256: b5b5a7c4b56bed1aa0aa0b1ed595a8c74459df2e63317a5f2cbec17dbdb19314
font_01_sfnt_off00013fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBC 11748 bytes
SHA-256: fba2bc6e8672648268fac010abf25dd9fe2b3d005524335eafa2c706ef194fd4
font_02_sfnt_off00016797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16797 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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