Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ddcf06f3839a5a…

MALICIOUS

PDF

73.1 KB Created: 2021-05-14 19:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 889cbf71134113b544e94e450c755b67 SHA-1: ddcd0045f3338fd11f009b9ec5e866391fc06f88 SHA-256: 98ddcf06f3839a5ac37101c85d72970c658728222454dbd55f5493838db341ea
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'repairman for ge washer' UTM term indicates a lure to trick users into clicking. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=repairman+for+ge+washer PDF link annotation
    • https://cdn.sqhk.co/noxibogalu/if6fKOm/nofalubesofosu.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/9ih2ja3/5912991294.pdfIn PDF document text
    • https://zifokodogip.weebly.com/uploads/1/3/1/3/131398222/4399866.pdfIn PDF document text
    • https://cdn.sqhk.co/wutijiwatar/iathbhh/wesun.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/cRheibn/chess_app_offline_multiplayer.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/jj0ihcg/christmas_cards_psd_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/ijjdzhe/mansfield_toilet_runs_every_few_minutes.pdfIn PDF document text
    • http://gusanod.22web.org/vabuvekizekajazep.pdfIn PDF document text
    • https://cdn.sqhk.co/wozovege/2iao9ih/charest_reporting_email_address.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/eAighjS/19206103705.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/giFqjaM/37569618466.pdfIn PDF document text
    • http://natasisenexu.22web.org/satire_in_a_modest_proposal_worksheet_answers.pdfIn PDF document text
    • http://waguzeb.66ghz.com/vinosasume.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/idwijSk/zombie_killer_paintball_gun.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/1144570.pdfIn PDF document text
    • http://bikaxamasazawas.iblogger.org/gafeludogakudar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_eeb2b02775504c4d81326fbcf697e605.pdf?index=trueIn PDF document text
    • http://winovewivigo.rf.gd/saturovuvoxumebu.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_8fa5499567e0495d97e2b57d412fdc80.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 5380 bytes
SHA-256: 0db42a40e208eb2275ebbc23013cf009294e1d7b9ae97cfa60b0a45182014996
font_01_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 11464 bytes
SHA-256: 2a8ec0234846859f81b1dd51e5f451527f12fd1f05d7c665f9c6f19bab5ae910

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