Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cbf62132579c94…

MALICIOUS

PDF

87.1 KB Created: 2021-04-03 00:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80fe80b7f31dde5893281d7a54c8f38c SHA-1: 7d355144526b10333ef03901c7809b7523fb8283 SHA-256: 22cbf62132579c9408ca393ba7842cb7e7c9fbfd2cd901dcbef7a8ef6dcfcac4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=negative+binomial+regression+interpretation+spss
    • https://cdn.sqhk.co/dopiporajen/gCycgem/sowepelewa.pdf
    • https://cdn.sqhk.co/vemudumuxixu/Sgcwghd/plane_with_2_helicopter_rotors.pdf
    • https://cdn.sqhk.co/rorajakura/hdij1ja/ivry_hall_instagram.pdf
    • https://cdn.sqhk.co/wadelovelo/jhgich3/hubby_birthday_memes.pdf
    • http://bitcoinlearningcentre.online/77765204697z5f96.pdf
    • http://silkhfig.bid/2615477242401cmu.pdf
    • http://shoplus.info/hampton_bay_replacement_remote_uc7083twcr4p.pdf
    • http://blablablacar.online/skyrim_failed_to_start_error_code_809l78h.pdf
    • http://select-get.top/flower_garden_layout_planner_freeovkmk.pdf
    • http://marafonsport.site/44706186910ndqrp.pdf
    • http://aires.fun/how_much_is_ddp_yoga_on_demandplyob.pdf
    • http://idem-peshkom.ru/html_to_api_githubzxwll.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_a9c8214f9d0c4f1b9230293cec86405e.pdf?index=true
    • https://s3.amazonaws.com/kovilowab/20988001097.pdf
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_dc97808d9e6f43ef9eacc012047b7d89.pdf?index=true
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_fd813eb280a14fb9971ed8ce551474d2.pdf?index=true
    • https://s3.amazonaws.com/fowikorejodi/googlemaps_android_app_tutorial.pdf
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_0f6b2baf96424fbd982faa670c4a4687.pdf?index=true
    • https://s3.amazonaws.com/dejolavubukugeb/75369661848.pdf
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_49866ef6137a4a82b848db6172cd7601.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115f5.bin
8be4cb623cfead3d897838898b740706384d181573ae96eaee6f8634fcae826b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 5308 bytes
font_01_sfnt_off000127fb.bin
5dabff6410417a4474af4c7d7491b5cd310de13c8b325390015d271207965b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 11400 bytes

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