Malicious PDF — malware analysis report

Static analysis result for SHA-256 1827c51116a31d01…

MALICIOUS

PDF

104.9 KB Created: 2021-02-09 10:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4047eb2f5031998baf8cb8e3c96ea383 SHA-1: 83ab4df5c39cc534f62007aff7195b3207b5f493 SHA-256: 1827c51116a31d019219b33e7f39f9eb7d704a91c005fd88f8a1b5b4468d5247
252 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDFs hosted on various domains, many of which are disposable or suspicious. This behavior is indicative of a link farm designed to distribute malicious content or phish for credentials. The presence of a critical PDF redirector link and ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 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://yafferge.ru/123?utm_term=5e+inquisitive+goggles In PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5fcb1dbc3927f.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/4568778.pdfIn PDF document text
    • https://rugexosijebup.weebly.com/uploads/1/3/4/0/134017508/wilimojir-fadawivusotosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_601d58811052f.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/xazagexikarosat.pdfIn PDF document text
    • https://zodixezujiz.weebly.com/uploads/1/3/5/3/135345824/1681043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_6021bf278ce1f.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxedanafowa/qgdheoh/68200761980.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/6a4e6b185030.pdfIn PDF document text
    • https://kanemonel.weebly.com/uploads/1/3/5/3/135319287/7064042.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5ff4cb7bbb32e.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/fic4Kgc/cancel_hallmark_movies_now_apple_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/fjaiioi/english_grammar_stories_and_exercises_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/ZjjXXjE/how_to_draw_cartoons_download.pdfIn PDF document text
    • https://mopirolelawa.weebly.com/uploads/1/3/4/0/134012876/b90e554c55.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/jikifrk/finger_guns_drawing.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/vatoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421056/normal_5fd0d5ffaae2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470409/normal_5fe1bff05f22f.pdfIn PDF document text
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/gokimebetuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zakivijojinikij.epizy.com/zifudebarimajona.pdfIn PDF document text
    • http://notufexunu.rf.gd/applicant_guidebook_icann.pdfIn PDF document text
    • http://vidavizulovox.rf.gd/arrocera_oster_4723_manual.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_off00015e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E84 4760 bytes
SHA-256: 42c6618192f294f4f031e70082497bfbe411d9494de9b8f6da4d87696d83b479
font_01_sfnt_off00016ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED6 11208 bytes
SHA-256: 7aef36cb4187eafa025837c8e303c6dfe03de5248ff091641c7c349911e5af85