Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5fa9d254c7f9d1…

MALICIOUS

PDF

73.5 KB Created: 2021-03-13 13:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a164a654ee0b4a3012b530e4182e82f0 SHA-1: 37a4f33ba2626bbdc87f84ea03f10fe461557f64 SHA-256: bc5fa9d254c7f9d1ea98b22de92fe654ef5052b7a10468f6d8b9aca7d2ed9478
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/strik?utm_term=how+to+see+page+breaks+in+word+mac PDF link annotation
    • https://cdn.sqhk.co/lepowabog/nhcsicU/fodozun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5ff3e6474bfe4.pdfIn PDF document text
    • https://julalawigito.weebly.com/uploads/1/3/4/8/134869680/681720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_604c9bca4ca7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5fdbfa8184d1d.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/hj3Logj/64391021641.pdfIn PDF document text
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/vunaxusotanomanora.pdfIn PDF document text
    • https://cdn.sqhk.co/kekoseni/ibVkGzo/speed_racing_ultimate_4_mod.pdfIn PDF document text
    • https://xasevezivim.weebly.com/uploads/1/3/5/3/135302984/pitiwup_bumipod_vemujabidupor_nutidulufone.pdfIn PDF document text
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/21e7ee6.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/2hjoVtx/acrylic_nail_ideas_short_coffin.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/aEgi9TA/guitar_rock_and_roll_cake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesositug.epizy.com/jepavu.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/wpf_listbox_controltemplate.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/75412226426.pdfIn PDF document text
    • http://sitotozip.rf.gd/26364443759.pdfIn PDF document text
    • http://sisawujeza.rf.gd/graph_inverse_functions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/45404529433.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/agentes_economicos_unam.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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 5616 bytes
SHA-256: f1b5e7f66c2bf5eca6f10d39ea74b8f14e3862251595fdd8d5fa433b8dd37d94
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 10260 bytes
SHA-256: 806fc1d8b96f055ed9d5f779fd339afa50422b2ac3c161d0e46d54d8ccebfa7c

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