Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d88e45c0d98ee6…

MALICIOUS

PDF

73.3 KB Created: 2021-02-18 07:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5a56dd12e41b0d0c69bfdca25ee3c305 SHA-1: dd8ab5dc2892b60ef343f01fb5fcbb5329ea14d7 SHA-256: 86d88e45c0d98ee63a60c872b469c1611f6da51d8af277819dfbcd0404fccc44
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=the+devil+wears+prada+streaming+vo PDF link annotation
    • https://faxuritenorajap.weebly.com/uploads/1/3/4/5/134585079/wutoju.pdfIn PDF document text
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/5835573.pdfIn PDF document text
    • http://kufigada.22web.org/15081751616.pdfIn PDF document text
    • http://rcasino.info/corresponding_sides_and_angles_worksheetl6eqv.pdfIn PDF document text
    • http://ueuniti.xyz/razer_synapse_not_openingjny1m.pdfIn PDF document text
    • http://haifaiv.ru/67078139118ksvo7.pdfIn PDF document text
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/a27af71.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/romomixud_wixek_nefixebuturaza.pdfIn PDF document text
    • http://antileqphh.site/waxewegifgfgdd.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/lerupokolozokot.pdfIn PDF document text
    • http://ropiwijubasa.22web.org/kewirulumitafe.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/5ad6c3.pdfIn PDF document text
    • http://clientesdkb.com/zajojomuzinepugusalujazupxlpn3.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/sanimanijexikufu.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://lulikeleweworup.epizy.com/21023012015.pdfIn PDF document text
    • http://bibobega.epizy.com/34681848544.pdfIn PDF document text
    • http://kizarepopudoso.epizy.com/teoria_da_administrao_cientfica_resumo.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_off0000c3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C2 5260 bytes
SHA-256: 44dff1062c49c02f066f94aeb77d5faaa09b482f1b9a1fa6acbe2263e95648c9
font_01_sfnt_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 16488 bytes
SHA-256: d8ae03aeb9f172c3ee99789db7f6480abadced1384ff8fb143a009f2c718903e
font_02_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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