Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc7c06e045a35d9…

MALICIOUS

PDF

82.1 KB Created: 2021-03-18 20:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 22cc972c6dd0705f868631e72c35c83a SHA-1: 9826baf84269da5b34a9236ceeb3e3a8f8429c48 SHA-256: 0bc7c06e045a35d95381be27b1f42dc94606d7b06a4645ed0124b815ad772abc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked PDFs. No scripts were extracted, but the sheer volume of links points to a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=idiot%2527+s+guide+to+nfl+football PDF link annotation
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/wanotuwiko_kurivuxujexoxum.pdfIn PDF document text
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/finisumobixod_jigotisamezepel.pdfIn PDF document text
    • http://sufinamek.iblogger.org/30159001835.pdfIn PDF document text
    • http://bonusiotsbera.online/skyscraper_meaning_in_marathi6p1kd.pdfIn PDF document text
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/08d2086.pdfIn PDF document text
    • http://barbanapoli.moscow/bounce_tales_game_cheat_code_nokiaximnj.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/pasawe/vewixi.pdfIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_075fc2b11eb74445b5d3b99006414bc1.pdf?index=trueIn PDF document text
    • http://ruzoguniwu.epizy.com/centos_8_beta.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_acf7cb624291479c8dd274754b4f55da.pdf?index=trueIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_418aa66cc8f0487484ab98f74b6aa3df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/39198259293.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_0976c9c31ca64a09bb915662736a70ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/15912200069.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/cyberpunk_2077_ps4_review_ign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5362d331-cc2c-4712-8a99-795df11a05f2/how_to_paint_by_numbers_for_adults.pdfIn PDF document text
    • http://donenufalu.rf.gd/action_adventure_games_offline_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9e8f7d-6191-48f0-abc8-3eabc05c3377/jofexis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab459fd-d0d5-4dd5-afbe-95b28b75db10/34927258350.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_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 4972 bytes
SHA-256: 09f5645e13ebac3f0c32cf67403c0ec5cbf23a2794910abb2240f01ad5ffc403
font_01_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 10952 bytes
SHA-256: a3b063de829e030f1dc7cb27c03f755547f299d305cd921e5e03793da2dfe43d
font_02_sfnt_off00012ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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