Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8a71931f0b51cf…

MALICIOUS

PDF

74.5 KB Created: 2021-05-17 14:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c0fc7ff026e7f3ddb9e44f4f5ca035ea SHA-1: daabfdc1b26c21dd000386874d23637d8107d3ba SHA-256: ce8a71931f0b51cf5a040ac9a2b67e9593f54c285b486c022160254997136137
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. It contains a large number of embedded URLs, forming a link farm likely intended to manipulate search engine results or host phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+scope+rings+do+i+need+for+an+ar+15 In PDF document text
    • https://cdn.sqhk.co/zedawuzijis/mjigfij/best_voice_recorder_for_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_60049606c2406.pdfIn PDF document text
    • http://xezifimo.iblogger.org/barn_burning_summary_murakami.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/huhoEij/metal_spinning_tops_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_5feaf75d794d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_6069e6cdaa42e.pdfIn PDF document text
    • http://kanurapubefuxo.iblogger.org/black_box_thinking_audiobook_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/bvjaW0M/stick_hero_fighter_mod_apk_download.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/98b48224-29de-4c0c-9ae9-64d46bc8552e/xumibevoli.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_c004122ab31e4fba9b85e06c3b01d7bc.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_fc0a3724c967467f85dc8c885c202c6b.pdf?index=trueIn PDF document text
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_30e51ec53bd74b91a866a96e62ad6e24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7731bb3b-48fe-44de-a22c-a0648fe6c8e6/davagexuxibup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5deed8-d440-4ec1-9357-cebfffa38c3b/fender_super_champ_x2_problems.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_b5817bf219284ee987278a6bc7eade1e.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_a9569954bf2049dcaf527af488c25d3f.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_968390a316b84a278a3b378b840a368c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6723c231-c744-4307-a1c2-de6f405f864b/how_to_teach_life_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d778c8-71da-4b98-a121-d002110007ff/6401650431.pdfIn PDF document text
    • http://zosonigileg.rf.gd/90876995802.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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 5572 bytes
SHA-256: f1dd000c1c004e5f0daff318911eb8dc2457fa51d9fab6208c8ccb7a6b0a5bcc
font_01_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 10816 bytes
SHA-256: 163bc3189cde24791c631e25f88ea0b51de7d8bcc653dd009b2599b60dcd87f3