Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f757c2c179ba115…

MALICIOUS

PDF

75.8 KB Created: 2021-02-19 07:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7937a51a649d92585f1f2877336f0cd2 SHA-1: b7335a8b6c09c6c1601e4327efa22ab61aa6be53 SHA-256: 4f757c2c179ba115c5bdc9b40739f3685366efecc60cda71a88057d0a3f53bd3
244 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics as malicious, including a redirector link and a large link farm hosted on disposable infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=on+writing+and+worldbuilding+volume+2 In PDF document text
    • http://rollernefrit.xyz/hp_elitebook_8460p_repair_manualmsxzc.pdfIn PDF document text
    • https://xidifapub.weebly.com/uploads/1/3/0/8/130873728/gololulovigikif.pdfIn PDF document text
    • https://cdn.sqhk.co/guzunilepin/jelhehd/aaa_phone_number_customer_service.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463803/normal_5fe247e5eaabc.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/hdihwjh/42527733933.pdfIn PDF document text
    • https://kogijusixi.weebly.com/uploads/1/3/5/3/135312463/zazurevuxalatef_jezuxomamazimev.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/9BGNFyn/rirorutuxapawol.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/hihaidY/sonic_boom_show_episode_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5ff120df2c554.pdfIn PDF document text
    • http://stroiline74.ru/1944_d-_day_operation_overlord_game0k5ky.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/8689949.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/hvjeOha/sorubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_6022c4ffdeb17.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/jaiajcp/49092105100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_6013a2df8d1ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/badodemebo/ameda_elite_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/business_report_writing_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/8487979170.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_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 5420 bytes
SHA-256: 7a68ed396f8b5f301bdd312148161437f43afae24aab7b6eab1066ca775af1f6
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 11760 bytes
SHA-256: cedca87597601e3d1dcdc9386d63edfd2c90107b76936918d65fd7a0bb09520c

Open this report in the interactive analyzer, or submit your own file for analysis.