Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b881071b4554330…

MALICIOUS

PDF

105.8 KB Created: 2021-04-01 17:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 60d5d7fae8ca8b808a507c6c7b40b132 SHA-1: 9f81acd4576369214d19a64b871733e5ffb5ff36 SHA-256: 4b881071b45543308e8c040486e25c63c5fdd9d714b182c249f4d2f96d6cb7aa
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 0.9997

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
  • 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://bologen.ru/wix?keyword=titan+quest+oracle+leveling+guide PDF link annotation
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/romunef_molav.pdfIn PDF document text
    • http://milafikolume.iblogger.org/open_set_in_metric_space.pdfIn PDF document text
    • https://cdn.sqhk.co/wizevomorofe/ihugfgc/ditejumevav.pdfIn PDF document text
    • https://dokurawufiza.weebly.com/uploads/1/3/0/7/130739275/lesanogibopixal.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/ijgesjb/barber_shop_logos_pictures.pdfIn PDF document text
    • http://befemuvejizu.22web.org/75132870943.pdfIn PDF document text
    • https://salupoxegiras.weebly.com/uploads/1/3/5/9/135961269/4985924.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/bhbIid8/72785763018.pdfIn PDF document text
    • http://gomakugagazeg.iblogger.org/65701747203.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/yhhm3li/mabovive.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/khf3jj3/digibaruzaxudup.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/91d6979c542.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravitujupap.epizy.com/little_fires_everywhere_season_2_episode_1.pdfIn PDF document text
    • http://texigoxu.rf.gd/able_calendar_2020_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f2ffa2-3bcd-46eb-b7df-b556e89e4669/26530676614.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/tujupijaneludada.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/bangkok_city_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fe455c-c3d1-4f31-8336-7542163d2f00/91911539046.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_off000158e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E5 5240 bytes
SHA-256: 44257f4829f0b5e765ea324107f6b7f12aa938891303b10e8e1ff363a360aaca
font_01_sfnt_off00016ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC0 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001734e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1734E 11028 bytes
SHA-256: 128f8a37354175378984db60ff8e9310f820b7dae63f6156975d72d8ce887e69

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