Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cc280d0c3f4cd3…

MALICIOUS

PDF

78.5 KB Created: 2021-03-06 10:42:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 28f634c7a133717cc97d73e15d361c4b SHA-1: cf95e85c831f2f5b553befa765599c3ee74f29ef SHA-256: b3cc280d0c3f4cd30f26ce241a58dfd222ade3bb7222ed3d4246355dbd8a777d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with heuristics suggesting it's a link farm hosted on disposable domains, likely to manipulate search engine results or serve as a distribution point for further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or content-luring attack vector, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/wix?keyword=plain+folks+advertising+definition PDF link annotation
    • https://mirivibi.weebly.com/uploads/1/3/4/2/134234555/duselakonid_pavoxupoles_gorexibuwosikop_foribupewomuke.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/1143410.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/wametezono.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/1425121.pdfIn PDF document text
    • https://tofoboloronu.weebly.com/uploads/1/3/1/6/131636632/2516439.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/shadowrun_rpg_5th_edition.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/why_are_my_garage_lights_not_working.pdfIn PDF document text
    • https://gebobofivogaxe.weebly.com/uploads/1/3/5/3/135308574/jazibug.pdfIn PDF document text
    • https://lidimegofomizut.weebly.com/uploads/1/3/1/3/131380930/vilarak_rizojukariv_ferubitinifa_vewonidet.pdfIn PDF document text
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/23d9d60.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
    • https://s3.amazonaws.com/wamatasamegu/avatar_korra_game_apk.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_feea9620b2084f4289aa88e2af2bf0da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57db0c5-c21e-48ab-ab1f-20a2d161aa40/81343139492.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/41266434872.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_9330cfec3cc84684b962ca799eb5a8c9.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_78d7caf94efa457493c254280eb6cebf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6338fc20-4e59-419d-801a-c520eb7af240/titans_curse_synopsis.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/19409348505.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/mitifolupogalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2236aafd-71f1-4d30-97e4-bdd0093ce6e8/18508702825.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/vonshef_manual_pasta_maker_instructions.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_f6802f42e10e4df2b7111c034f11f5e8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 4988 bytes
SHA-256: f0908b22aeaae21f4d48024bbfe4a66e72a632cac6a3e5663033138da748701c
font_01_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 10684 bytes
SHA-256: 51d779d2e1d78a092ef8e42c7d7288dc479a120f10d63e4d8ebdb27a6e45c9df
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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