Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bddbf5f1f81e6d…

MALICIOUS

PDF

71.9 KB Created: 2021-03-14 11:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 86bdcc6cc7bfcb57b00a021c64f4baed SHA-1: dd0eb02c7d590ea751769b21d6e2b06361d09152 SHA-256: d1bddbf5f1f81e6da343e3951c7c2df670378337da8145747ce344d4a18feb2a
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://kuzutuzo.ru/wix?keyword=the+thinking+jewish+teenager%2527s+guide+to+life PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413013/normal_6003bdd59d14e.pdfIn PDF document text
    • https://fugowekarulosom.weebly.com/uploads/1/3/4/7/134700114/wofebamikerobewipi.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/PgcDShb/vefuni.pdfIn PDF document text
    • http://meblik.su/gas_wall_heater_not_turning_on2dshf.pdfIn PDF document text
    • https://dujewukemapaf.weebly.com/uploads/1/3/1/4/131453220/temis.pdfIn PDF document text
    • http://khareedforosh.com/megalavir14jq.pdfIn PDF document text
    • http://baffer-shop.space/worksheets_short_vowel_sounds9t9wh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461250/normal_5fc7267f41637.pdfIn PDF document text
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/b2d2d51e.pdfIn PDF document text
    • http://makamar.online/wupavusesejelodukoj6h66.pdfIn PDF document text
    • https://witokilufixag.weebly.com/uploads/1/3/4/7/134739393/2027535.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/jaXJYib/58487813622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_601c605859699.pdfIn PDF document text
    • https://lekolusogi.weebly.com/uploads/1/3/4/3/134365603/3653009.pdfIn PDF document text
    • https://pekamadepo.weebly.com/uploads/1/3/4/3/134321673/sifupegasojel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_a61a189f32274a10b16dd95884914031.pdf?index=trueIn PDF document text
    • https://bd42ab16-aebe-4c72-ad16-c2e271b509d0.filesusr.com/ugd/c4ccc4_f9510ba7328b47c7bd3a48c9e80d177a.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_5e51cf4928224375ba35286254a73d72.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_8e880ea2bca34f5fbf7416e7956c9b07.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_af19489950f944f59b2d659ded1cb0a0.pdf?index=trueIn 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 5384 bytes
SHA-256: f9e6bd41fc40b239891f47649f78c86b65b9778db9a7c91560fb40b71827ad95
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 10844 bytes
SHA-256: a3953e997da56c63d3bffef4adee6e0d11f64cad3ff81bbddd0e4d4684bc0f2a

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