Malicious PDF — malware analysis report

Static analysis result for SHA-256 b330411e277dc244…

MALICIOUS

PDF

93.4 KB Created: 2021-02-20 12:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 021471dd628bcee1f2f1e5a4a4f67a64 SHA-1: 718943dd25e580c3176672f7698dbcf1b1590fd4 SHA-256: b330411e277dc244ef10ba3162cdb256535754686104baed5b43279ad217cd95
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs that point to disposable domains and known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains elements related to wkhtmltopdf and dates, but the primary threat lies in the external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/123?utm_term=the+second+choice+summary In PDF document text
    • http://repair-planshetov.ru/honorable_foro_mechero_2019m983w.pdfIn PDF document text
    • http://help-copyrightservice.xyz/wifugupadebewujiwelibast8xk.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/hbhdoT9/dude_perfect_hunting_stereotypes_bloopers.pdfIn PDF document text
    • https://sujarusokebukok.weebly.com/uploads/1/3/1/4/131437349/taruxotu-vukozotawalozu-numiwuwipapit.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/icwzzni/large_yellow_apple_calories.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/dowetixovokukamulu.pdfIn PDF document text
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/duvuzeguxu.pdfIn PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/lavixebijizisu_rolosuwub_damikalabasetos.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/djijhar/25414236984.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/49789112696.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/neurontin_dosage_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/limitasodezoxi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13337 5200 bytes
SHA-256: 78125ffa13694eaa3ea67362a48f793a5885c992acffd3df3d0bb14317acd3f3
font_01_sfnt_off000144ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BA 10740 bytes
SHA-256: 39b9659f89b658eb0028d81d21a04e2ad8b5bba69f5def257c45914e6e42bfc2

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