Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bfd8b3a0cba1bf…

MALICIOUS

PDF

90.8 KB Created: 2021-06-10 19:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d05ca094151cb90ebc35bbbcd667e39a SHA-1: 3cf378b81c7b7a8d145d687cb356f3fb22506ef4 SHA-256: 16bfd8b3a0cba1bf5d11b288926b0863ad9201a17a14f889bb449b2bb10f5ed7
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm designed to drive traffic to malicious sites. The primary URL, ketchas.ru, is presented with a "think and grow rich pdf full book" query parameter, indicating a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/pbw?utm_term=think+and+grow+rich+pdf+full+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464301/normal_602effa42dee8.pdfIn PDF document text
    • https://favujoki.weebly.com/uploads/1/3/5/3/135302790/6519aac99f.pdfIn PDF document text
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/saninotefesos_mivavunalosadax_bogufo.pdfIn PDF document text
    • https://kolukofutire.weebly.com/uploads/1/3/0/7/130740340/riwunapuwunejelabake.pdfIn PDF document text
    • https://bowulujakem.weebly.com/uploads/1/3/1/0/131069806/revej.pdfIn PDF document text
    • https://tekujutiwud.weebly.com/uploads/1/3/4/2/134234893/1183781.pdfIn PDF document text
    • https://lefitujeledezov.weebly.com/uploads/1/3/6/0/136028835/845483.pdfIn PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/5df97d107.pdfIn PDF document text
    • https://fadukopita.weebly.com/uploads/1/3/1/8/131856205/xiwaduregufuxa.pdfIn PDF document text
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/xofisuma_budupawotad_lavazuf.pdfIn PDF document text
    • https://sikefenuvip.weebly.com/uploads/1/3/4/0/134012601/abbd6949d3b.pdfIn PDF document text
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/sodiledirax-vefova-judemesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_6044f7db43d94.pdfIn PDF document text
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/tezejaxazefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_606a89f75c252.pdfIn PDF document text
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/serusipefivunotab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_60588bec03140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_603b9d7b64907.pdfIn PDF document text
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/bojoseto-sotixarobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/781e851d-edc2-4b65-a52d-39a96b19c635/where_is_the_filter_on_whirlpool_front_load_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57cae705-bb75-4e84-8ba1-b93affb4f027/feng_shui_2_rpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd793f4-03ed-470a-9f48-718881e66684/my_kitchenaid_mixer_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e4899c-cfc2-429f-a3dc-1d1ef11c326c/dyson_vacuum_cleaner_repair_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67bc434c-670b-4d68-8eaf-2ac4df13f950/38773156248.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_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 5484 bytes
SHA-256: d62543bdb03a6afcf521ec18cd86d6dd3475d2ed6ce34b450f40ef119d616b45
font_01_sfnt_off00013787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 10724 bytes
SHA-256: 091f75d633e93613fd5ced4984d6a5561ee616a8a8fb09e9eff429fe5ebe49cc

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