Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52b3814e2a78339…

MALICIOUS

PDF

80.7 KB Created: 2021-05-09 02:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 33a2b3fbeac6ad99203287b1e2e0a9e6 SHA-1: 597e0fdb0f307f94815784cbd978087d54c9d690 SHA-256: c52b3814e2a78339175aa37bac81fa463751098aedaefd6c64972cdf4e361218
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of a large link farm, with many links pointing to disposable hosting and potentially malicious domains like jumiwimov.ru, suggests the document is designed to redirect users to harmful content. The document body itself appears to be malformed or obfuscated, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=homer+iliad+fagles+pdf PDF link annotation
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/1157093.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/2695825.pdfIn PDF document text
    • https://pobozopidukav.weebly.com/uploads/1/3/4/3/134384736/103958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fde41ed90a39.pdfIn PDF document text
    • https://jezuvafu.weebly.com/uploads/1/3/5/3/135348480/069f2665d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420029/normal_600d1ff3b9db8.pdfIn PDF document text
    • https://gezifizisosuvul.weebly.com/uploads/1/3/6/0/136050083/92dc77b7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_6060627d24e8a.pdfIn PDF document text
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/7470762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6055cdd3a320e.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/50549f1a3dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5fcae8bd58f99.pdfIn PDF document text
    • https://tikigafose.weebly.com/uploads/1/3/0/8/130874564/xanele.pdfIn PDF document text
    • https://dipakexamima.weebly.com/uploads/1/3/1/0/131069759/tuwija-zifarodoros.pdfIn PDF document text
    • https://revininone.weebly.com/uploads/1/3/1/3/131380081/zikatinunaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/48beeb4b-212d-4169-8f45-56838364e765/bowflex_blaze_assembly_manual.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_78af4e755b3d4cffa8f75d5b015f4a5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9e7942-3ba3-4884-a570-7580d47db341/bluedio_t2_price_in_bd.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_b322614fe75849fa827cfa7b5cabb563.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3317db-4039-4305-a49c-f7d17afd98f9/jelimotis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ba3a8b-7516-419d-94d8-01ed93dd6e68/viwutab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/118af9b8-e0ba-4123-ae31-713d9e26356b/the_great_hunt_audiobook_download.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_9c235cc422624615a8f40d2f602f3c16.pdf?index=trueIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_ffd7201979df478cbe995d897426d0d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2460f46-6680-4dda-8390-6d908ac58b48/21308207204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2b0f76-cd91-4aef-80c2-5878feab7645/5692029533.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_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 5320 bytes
SHA-256: 2df1a14bcabeb00f66d29fbfab2c8eb2c1dc08c93f147dc9126f3d8775a523aa
font_01_sfnt_off0001109a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109A 10852 bytes
SHA-256: ebb8bcc29db61b18d75b837cd8e0d5a8a78c167e4cb631b6e09a21cc2093a8d8

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