Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0b1382705f3c72…

MALICIOUS

PDF

120.1 KB Created: 2021-05-08 19:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 58f44e88c4eaea1dcbc45d33783aea80 SHA-1: 2037544382566a24379ab99f86266c2f620a9e31 SHA-256: 6b0b1382705f3c72bd539e6a21a958759d8545850469f3b3881d5a64d455e94f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • 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://nipisod.ru/strik?utm_term=do+not+fear+verses+365 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420767/normal_600b52e00cd31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_5ff3f2be49ab4.pdfIn PDF document text
    • http://top-odejda.com/gejameruxabjmw8.pdfIn PDF document text
    • http://trenolgia.buzz/cbse_class_8_reduced_syllabus_2020-_21msa42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_604f4edc0babc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_5fd19afe3d552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_6052cdaec18bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_6028a6db3e098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_6059b211752b8.pdfIn PDF document text
    • http://meriline.store/what_i_eat_for_life_maddie_lymburner76qrg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6037d30a309a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_8fd9cdc949414505b8a13acdf7a3e3b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/jarogexoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/71584951174.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/rojeteg.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_d2273a9cc5e54d4eb0baf8be2a5bf2c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1f2537-ded6-40d3-9971-6ed79f733387/9187883422.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_e04e636f71a04d30ae1ca30f3f8b7b65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71730a96-4aac-4465-815a-0f496cdf7e08/zitisixawizudupipur.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/ge_toaster_oven_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27971180-f67c-43de-a4ab-72cd9ca33474/how_to_do_anova_in_excel_mac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E59 4968 bytes
SHA-256: b2db10fbdb84592dc9f26f833420836be034b038ba5bae1e2fa1b5662475fcaf
font_01_sfnt_off00019f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F47 10964 bytes
SHA-256: b74b25a9b1a91c4647b6cd3832f4ced59b90b047ed228c26f5fe8645b2906906
font_02_sfnt_off0001c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4D1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361