Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1cd686b063ecb7…

MALICIOUS

PDF

88.9 KB Created: 2021-03-15 07:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0031619d6b34c15bd97d97f6a901b96e SHA-1: d31df4974b14780df07984f2201c929458d9f2f9 SHA-256: 0c1cd686b063ecb7490fd3f8c8b86480ae3ee154f27bd6c8c41e78d785983306
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to medical research.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/award?keyword=pathophysiology+of+sepsis+and+septic+shock+pdf PDF link annotation
    • http://goldenframecollision.com/toyota_corolla_battery_light_stays_onqeeu1.pdfIn PDF document text
    • http://flash-sar.online/61120932227q5573.pdfIn PDF document text
    • http://myluckybet.xyz/mivaleriwopeligupaxifif008kv.pdfIn PDF document text
    • https://wipasajumavadus.weebly.com/uploads/1/3/4/7/134775966/wadelonifuva_lukikamepoxiroz_lapunizimatu.pdfIn PDF document text
    • http://betifogolejom.iblogger.org/business_letter_writing_format.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/baroba.pdfIn PDF document text
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/4435230.pdfIn PDF document text
    • https://rajikaluniker.weebly.com/uploads/1/3/1/3/131383998/dogaja_rupilotagis_gutexenez_zotumufapesefu.pdfIn PDF document text
    • http://runivofo.iblogger.org/42657079703.pdfIn PDF document text
    • http://delayikapy.xyz/934654345417fsdq.pdfIn PDF document text
    • http://twoup-viktoria.online/perfect_world_mobile_vs_pcupgld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukasazufada.epizy.com/14610034822.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_b711d2131bf4425895b2e0b2a848769c.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_7255943d4a754491b1c57211a88fee93.pdf?index=trueIn PDF document text
    • http://sanikivatuma.rf.gd/gopubodoj.pdfIn PDF document text
    • http://jilagikudi.rf.gd/hepatoblastoma_treatment_guidelines.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_7057c36b5fc741e7857542574daf471a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52af48bb-2f49-427c-bf4d-7c0b0905b6a8/what_bolt_pattern_is_a_2000_ford_ranger.pdfIn PDF document text
    • http://xekurugakur.epizy.com/group_counseling_skills_and_techniques.pdfIn PDF document text
    • http://falogivaxaf.epizy.com/powerpoint_template_free_pptx.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_093191b1227f4f298097095c3b8d522f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b211b6f5-cf16-4d2b-99b4-1db05c8ee35a/claire_breakfast_club_character_analysis.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_67d9ea660c264a168332051fdf50127d.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_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 5488 bytes
SHA-256: 15de11062fb313c3b6be1ee4f8dd5b252b3583aabc311eeba505b4ca66b12ecc
font_01_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 10792 bytes
SHA-256: 8d60eaa009f20e0d26ecb5cdb94136f79b10f2e7a2335b5a79e18d773bfb3cd7