Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7fdf5771fe685e…

MALICIOUS

PDF

80.7 KB Created: 2021-03-20 08:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e4485aaeaf3b0b287095601247c63fa SHA-1: d511b39e21f1990aaa04dc597de1a0d6e22d610c SHA-256: cb7fdf5771fe685e1697b6fc5dc8ab8bd100980bde81ae150e24436ea51fc852
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, https://xezojetit.ru/123, is likely part of a phishing or malware distribution scheme. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and trojan detection.

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://xezojetit.ru/123?utm_term=minimalism+live+a+meaningful+life+free+pdf
    • https://naxufubiromu.weebly.com/uploads/1/3/0/7/130738890/bivemaxufazof.pdf
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/tojaxipoxewawavewep.pdf
    • http://opencabinets.xyz/mxr_10_band_eq_bass_reviewqrb2r.pdf
    • http://zuwujamoruwipam.22web.org/monthly_accomplishment_report_format_for_teachers.pdf
    • http://jigunemav.22web.org/geramonenijimimumodasipe.pdf
    • http://ganalozugimak.iblogger.org/nalelakisupufe.pdf
    • http://tumbaa.space/loch_awe_fishing_reports_2018fq2sh.pdf
    • http://instapresent.site/86694666841eag2a.pdf
    • https://xexinujufametu.weebly.com/uploads/1/3/4/5/134502762/zowexemalapoxuwefa.pdf
    • http://soldonlakewood.com/crockpot_cooking_chicken_thighsdav45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sibazod.epizy.com/nekomabajusutu.pdf
    • http://terenido.epizy.com/wasuvezorajaf.pdf
    • https://s3.amazonaws.com/limewub/uc_mini_browser_app_for_pc.pdf
    • https://s3.amazonaws.com/gedimuta/malafivevazikimomaj.pdf
    • http://wajalapivibobi.epizy.com/iphone_and_android_meme.pdf
    • https://s3.amazonaws.com/padadutiseni/balupu_songs_videos.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/38272272013.pdf
    • http://bolesumedinix.rf.gd/automobile_engineering_subjects.pdf
    • https://s3.amazonaws.com/bufexa/felajepas.pdf
    • http://gedijusopekud.epizy.com/52270958174.pdf
    • http://javamav.rf.gd/88691280641.pdf
    • https://s3.amazonaws.com/kavalukato/java_swing_tutorial_for_beginners.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe0.bin
6c1aaa0525bc465cfa4724bf33fff0012f0e7aa81a1d9053d3d85ebcb56c2b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 5428 bytes
font_01_sfnt_off00010e51.bin
9d916f08bc70ab39f574dc7afa9bc7224d60612f10b27e50bcc4f1e04ab13a58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 11048 bytes

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