Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b7458e72950eac…

MALICIOUS

PDF

77.4 KB Created: 2021-03-06 15:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 55e0cde4df30eb078b4cbdabea4e75b7 SHA-1: 39bddca5847666d3b1889b3d1784dda03cd45c01 SHA-256: d8b7458e72950eac1eb2b25975b475c7f62d3defc6f1113cae9211717fe2ff72
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 0.9996

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://jacksth.ru/123?utm_term=2016+toyota+camry+trd+specs PDF link annotation
    • http://telewapor.22web.org/77151388668.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/b905468596ac46b.pdfIn PDF document text
    • https://cdn.sqhk.co/daguvemet/iii4Aud/drag_racing_cars_for_sale_on_ebay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_600cb05a96b2c.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/eqgiOcD/63535995976.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/fii27ij/full_steam_staffing_watsonville_ca.pdfIn PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/6953559.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/jg4Q0hf/bomibemexarijobif.pdfIn PDF document text
    • http://lupaper.22web.org/creating_artificial_gills_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/dTajifu/71176359199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5ffaa42ad5301.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/4767883.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/hjwhefo/braveland_heroes_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_603b38b07a10a.pdfIn PDF document text
    • https://cdn.sqhk.co/wafepazi/j7hj3T9/96581980832.pdfIn PDF document text
    • http://fovazewo.iblogger.org/loxurazomogoberofikutu.pdfIn PDF document text
    • https://vibisorimujeke.weebly.com/uploads/1/3/4/3/134344086/texulokaf.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/zjagjbf/hacking_voice_voice_changer_apk.pdfIn PDF document text
    • https://rupokolox.weebly.com/uploads/1/3/0/8/130813141/45ef65f90.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
    • http://sixanuramusasit.epizy.com/53821101785.pdfIn PDF document text
    • http://wejifofodig.rf.gd/36026150341.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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 5308 bytes
SHA-256: 4ee8e65331b4b880211e9abd2b5616c45ec1a46299ff428f412f8b7d45f46527
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 10712 bytes
SHA-256: bc2e06334bc8c97aa17e03ebe196d457c13a8dab5b98488e77fba1a97eed3d51
font_02_sfnt_off00011a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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