Malicious PDF — malware analysis report

Static analysis result for SHA-256 7236d2786bb57761…

MALICIOUS

PDF

78.5 KB Created: 2021-04-15 06:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eaafc166585f44b8cc6b9aa40574e2cc SHA-1: 150c1bb9f512ca2108fdf88f701f9628e8756aed SHA-256: 7236d2786bb5776105667cd8d51c503695e0d18b13b2a7597e2837ed29ea30fc
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/strik?utm_term=how+to+create+a+nonprofit+business+plan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403531/normal_606e96ff70322.pdfIn PDF document text
    • https://kegotewu.weebly.com/uploads/1/3/1/4/131437679/dc8fb892e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_605b734207d3b.pdfIn PDF document text
    • http://foselosen.sportsontheweb.net/soil_mechanics_and_foundation_engineering_mcq.pdfIn PDF document text
    • https://fabegobidik.weebly.com/uploads/1/3/1/4/131437275/9b240.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/wopatofinuliwibimugudol.pdfIn PDF document text
    • https://cdn.sqhk.co/muzipajat/jbwgchc/23111957280.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/gifgegf/dvt_prevention_chest_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/aG1iajx/saberforge_duelling_lightsaber.pdfIn PDF document text
    • https://mitenebomowal.weebly.com/uploads/1/3/0/7/130775142/2823529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415300/normal_5fffda1073c6f.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/dikuxafigogejinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_5fda3efa4d76e.pdfIn PDF document text
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/b13333ef2ed52.pdfIn PDF document text
    • https://vatelepetelijul.weebly.com/uploads/1/3/4/7/134765631/fufagupokamu.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/703c573e-234f-48d7-89dc-20dcb7635a00/tuletofovuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb280db8-55b5-4c91-967a-d3002a86c692/49475303018.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_f07973a358bf44beb06baee80be16760.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d73a709-4709-4abd-9dd2-b93dcdb25e1d/lodogaxuvigejogovutovulug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390b1396-726c-4163-b5b6-027dae004acb/how_to_turn_on_a_pebble_watch.pdfIn PDF document text
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_e3492a970d1c4670b309c084f1603e52.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_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 5200 bytes
SHA-256: 64ae136090cead6654974aca73759fa36774cd1f30c2f99c44d1824b25f5a258
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 11428 bytes
SHA-256: 5e3d1674f4559fd72f66a3f93626f82527bf68e6ac7fc7fbf3e5229beec52d47