Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af2712798b00d41…

MALICIOUS

PDF

72.3 KB Created: 2021-01-08 19:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4d101b2ef9f3650b7be14a269259a0c7 SHA-1: ed33dd68a85d7d97470bee051882a17d7c5e85a1 SHA-256: 3af2712798b00d41ff89302ca28951080ff90ec84906386493004c6c73a999c6
252 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://gettraff.ru/123?utm_term=best+scrubs+episodes+reddit In PDF document text
    • https://cdn.sqhk.co/bofilewidil/gfgcYgc/national_geographic_channel_number_in_sun_direct.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/detexatek_beforuxawu_kowesovuwetas.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/iiMheqs/9186573073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5faa56477d647.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/fgfhbuZ/mefipetumu.pdfIn PDF document text
    • https://rezapikuxodet.weebly.com/uploads/1/3/0/9/130969426/viluzotiminom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451375/normal_5fde375958366.pdfIn PDF document text
    • https://domuvajedoxu.weebly.com/uploads/1/3/4/8/134847007/nudukabejevopewezalo.pdfIn PDF document text
    • https://cdn.sqhk.co/vevigagexoxa/PG1hbjg/stack_color_hack_mod_apk_download.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/4484051.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/YIHoqi4/vuwilenajiwumabuzukuzot.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/zokivudogubixixerumi.pdfIn PDF document text
    • https://leketupafap.weebly.com/uploads/1/3/4/5/134527175/minagik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 5016 bytes
SHA-256: a3456d178d0486bfe66c3eb4ee79418d910851a2da115f6c1445e8b6919566ef
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 10228 bytes
SHA-256: 955811c62a0dda57ce06adeead02b94e1a0c3a92bb86cb69e9a94261fada2ff0

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