Malicious PDF — malware analysis report

Static analysis result for SHA-256 859c774895bcf045…

MALICIOUS

PDF

72.8 KB Created: 2021-03-31 20:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63a77e1c0ff3360f95989d4605abaefa SHA-1: 2227768b0657b59d38b484852edd456471cdc5e3 SHA-256: 859c774895bcf045987dcb48223344980b9f5095201a16287fbff643996ff580
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. One prominent URL, 'https://jumiwimov.ru/strik?utm_term=how+much+is+a+titan+440+paint+sprayer', suggests a lure related to product information. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+much+is+a+titan+440+paint+sprayer
    • https://cdn-cms.f-static.net/uploads/4403120/normal_604504a07e58f.pdf
    • https://static.s123-cdn-static.com/uploads/4415519/normal_5ffc2b4eb56d9.pdf
    • https://cdn-cms.f-static.net/uploads/4484154/normal_60257d2c43e77.pdf
    • https://cdn-cms.f-static.net/uploads/4376852/normal_6018f775d1178.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/74d3a0af-a696-429e-84d6-0cbefd371f58/sat_essay_score_scale.pdf
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_f6a612ee896d4817b42a495791b27b59.pdf?index=true
    • http://jofewizabo.rf.gd/26221429837.pdf
    • https://uploads.strikinglycdn.com/files/aa17f55c-95d8-490a-ab86-00c38aa63228/99222871989.pdf
    • https://uploads.strikinglycdn.com/files/72dbbd45-cb4f-4c68-8403-6d1b8c4a766a/hansel_and_gretel_short_story_with_pictures.pdf
    • https://uploads.strikinglycdn.com/files/a394996a-3e06-463e-bb8d-de8d1dcdf6da/7860dw_replace_toner_reset.pdf
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_c0103892f8e84c1982f8c979999243af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/73c103db-91ee-4541-948f-aafcd35f98b1/corian_countertop_dealers_near_me.pdf
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_1122a1857ef44fd780cf44b9157bff4e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/98ac012d-789d-49fe-9578-a33ff104ddf9/tusugadujizadazen.pdf
    • https://uploads.strikinglycdn.com/files/d1264ada-b6d0-4bcb-a0fa-24e24565b59f/fanamukofelizikow.pdf
    • http://linewezidewixa.rf.gd/tenancy_agreement_template_free_download.pdf
    • https://uploads.strikinglycdn.com/files/a54af51a-f1fc-42cc-8f1c-8345d35e1340/golijapavurigunuxosozo.pdf
    • https://uploads.strikinglycdn.com/files/4b33a458-acc2-4aac-a3e7-5a24c95f3f48/bohemian_rhapsody_piano_only_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/9bdd1853-abaa-4d25-a5f2-159c473c3b33/23070230578.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc3.bin
f2a9db4e7874f8e7c411e8364046db66b05ac884cf1ace6b44d41307be8cc2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 5524 bytes
font_01_sfnt_off0000ef79.bin
ef09492947abbb46997ced4bd7d1d8a7a767c1be456d560736cf1b4e295d7234		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 11364 bytes

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