Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b170f9d6152fa7b…

MALICIOUS

PDF

83.3 KB Created: 2021-05-07 00:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 957717eacfa0e6e0740a2c12d4effa4d SHA-1: db45a51612868fb4ce4a7d515ea39e48eb20fc3a SHA-256: 6b170f9d6152fa7b07a67db81fdd131cfa58bc49cda8e76a531779ea0727648a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content, likely related to job lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 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://xajibur.ru/strik?utm_term=electrical+engineering+tech+jobs+near+me
    • http://henrysavbr.site/56124382812zna8k.pdf
    • http://j3vnci4.xyz/throne_of_glass_audiobook_downloadobt2x.pdf
    • http://ig-verifiedsbadge.com/mega_man_mobile_game_free_downloadim213.pdf
    • https://static.s123-cdn-static.com/uploads/4407304/normal_600352bd4072f.pdf
    • https://cdn.sqhk.co/lanamixese/iifAQTC/bike_mayhem_mountain_racing_free_for_android.pdf
    • https://cdn.sqhk.co/pikevasoze/1VRhajj/wild_hamster_life_expectancy.pdf
    • https://cdn-cms.f-static.net/uploads/4461250/normal_6068d84fae3ca.pdf
    • http://dirtygirl.fun/87920788544iqfq9.pdf
    • http://maxist.ru/can_you_get_a_refund_on_mcgraw_hill_connectz9nl8.pdf
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5fd70c67219c2.pdf
    • https://cdn-cms.f-static.net/uploads/4466689/normal_6059fe3750582.pdf
    • https://cdn-cms.f-static.net/uploads/4387702/normal_606c9d672874c.pdf
    • https://cdn.sqhk.co/woselukafo/iu3NwOW/rubizegovuzojovorebilabud.pdf
    • https://cdn.sqhk.co/fafojipedul/awbggjb/ravon_bonner_stats.pdf
    • http://vivofuma.66ghz.com/ncert_biology_class_12_chapter_3.pdf
    • https://cdn.sqhk.co/wubofuse/3fggmjh/93984098139.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jagodamafa.rf.gd/ccrn_review_book_laura_gasparis.pdf
    • https://s3.amazonaws.com/wolina/ddo_request_telangana_challan_entry_form.pdf
    • http://lufaxosakovo.rf.gd/pmgdisha_affidavit_format_download.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/12712982236.pdf
    • https://s3.amazonaws.com/nufidibodudulad/nudupegokaniwimewebem.pdf
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_e2512593123e490a99183c19187ce6f2.pdf?index=true
    • http://pipobibof.rf.gd/the_economist_december_15_2020.pdf
    • https://s3.amazonaws.com/moduluzuxikari/soxesozaf.pdf
    • http://ximedamolaxeve.epizy.com/nonunonawejewamewajuzor.pdf
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_77649b78575441528b51c5cabb5b126b.pdf?index=true
    • https://s3.amazonaws.com/xanunafojuloki/budismo_zen_japones.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f274.bin
af4c89dbf19cabda84c5117c4d3bc04ec8590f3b0b014730037eec1f0c911e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5388 bytes
font_01_sfnt_off000104a1.bin
aa974edac06787bc750a1f5510cb53f9536ebcbdfe4aa01f028591ce225776e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 10752 bytes
font_02_sfnt_off000129aa.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 16204 bytes

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