Malicious PDF — malware analysis report

Static analysis result for SHA-256 58042cc68bca8ff3…

MALICIOUS

PDF

84.3 KB Created: 2021-05-29 14:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae96aad6f7a841ab679ef88c8b27473 SHA-1: a3e4481bdfed1879b21685b1b3e21419e98b737f SHA-256: 58042cc68bca8ff38dc847e35cb1192ac5148718f425957ac623074485008723
156 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 of which are dynamically generated, suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=how+to+clean+a+delonghi+dolce+gusto+coffee+machine
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6018663ab84b1.pdf
    • https://jexiwelim.weebly.com/uploads/1/3/4/7/134717468/peraworokakevef.pdf
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/woguru.pdf
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5ffa5bc343406.pdf
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5fd639a0655a7.pdf
    • https://cdn-cms.f-static.net/uploads/4414169/normal_6059ac35b65b2.pdf
    • https://cdn-cms.f-static.net/uploads/4472221/normal_6069d38922ca5.pdf
    • https://cdn-cms.f-static.net/uploads/4383147/normal_603e2510666d1.pdf
    • https://cdn-cms.f-static.net/uploads/4411479/normal_60268a008ce44.pdf
    • https://static.s123-cdn-static.com/uploads/4387928/normal_5fc59a4250785.pdf
    • https://tivufele.weebly.com/uploads/1/3/4/6/134615601/9948290.pdf
    • https://static.s123-cdn-static.com/uploads/4501503/normal_60073d67bd640.pdf
    • https://xavitutasufeja.weebly.com/uploads/1/3/4/6/134669981/tagelarofunukira.pdf
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5fe9eebcf3524.pdf
    • https://static.s123-cdn-static.com/uploads/4472768/normal_5fc7e70497b8e.pdf
    • https://gekawemugib.weebly.com/uploads/1/3/4/6/134623466/4725633.pdf
    • https://cdn-cms.f-static.net/uploads/4406771/normal_603c78faae43a.pdf
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/8ef6ace52f75c91.pdf
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/buninajomor_gigojo_xanenutu.pdf
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5fd09425a200c.pdf
    • https://dupevikalibo.weebly.com/uploads/1/3/4/6/134659617/2923524.pdf
    • https://wiriluwakuzukar.weebly.com/uploads/1/3/4/3/134316185/5708067.pdf
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/zuwatuve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a7e2fb6b-ec61-4950-b820-33863f7792cf/sikifatibukakeniraja.pdf
    • https://uploads.strikinglycdn.com/files/6e9a3941-42bc-45d5-a039-acb976c0d5cb/what_foods_should_blood_type_b_eat_to_lose_weight.pdf
    • https://uploads.strikinglycdn.com/files/6639cef9-c44f-4627-8391-03558f3f68a6/vozorovabu.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_off00010a12.bin
bb1b583e9768e90c4d1b1d2bfb16995b8c49a727ddb0858e3b97b53043733e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 5392 bytes
font_01_sfnt_off00011c56.bin
8ff1b12e0e83171861e28ae806cecae9af804bf062015e589fc69926f6d37e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 11540 bytes

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