Malicious PDF — malware analysis report

Static analysis result for SHA-256 c840b4de5da48502…

MALICIOUS

PDF

78.3 KB Created: 2021-03-25 07:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c70322606e2e3705cab49dc64d456eae SHA-1: db74716cdc12bdc9c5995e70f541d04dc6535ab1 SHA-256: c840b4de5da485023354584ea3b97917832eaa979783d935a08540c2985071fd
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://midufefew.ru/strik, which is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=what+is+the+average+density+of+the+earth+in+kg%252Fm3 PDF link annotation
    • http://nesobaka7.xyz/what_portable_heater_is_most_efficient26flb.pdfIn PDF document text
    • http://zanartcc.net/what_are_the_units_of_a_and_b_in_van_der_waals_equationg0e36.pdfIn PDF document text
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/jugekuku.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/3868491.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/42799650473.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/64141769808.pdfIn PDF document text
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/mipefar.pdfIn PDF document text
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/4573532.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/casio_privia_px-870_reviews.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/weapons_qual_to_promotion_points.pdfIn PDF document text
    • http://larekew.mywebcommunity.org/34085573840.pdfIn PDF document text
    • https://wavafebezed.weebly.com/uploads/1/3/4/5/134527209/9816db7808191.pdfIn PDF document text
    • http://my-favshopf.online/xetimififudurigukabuxew0cq5o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_0cad76ac72094404b085afd70c5a373d.pdf?index=trueIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/nizilirisunuxamotu.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_3cb8f74cbdb64cd79cb8205175bb1c75.pdf?index=trueIn PDF document text
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_603145df9a164862a612666ecaa763af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitirew/dungeon_fighter_online_class_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/lasovukugofubejol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 5728 bytes
SHA-256: ee944b9dbdba06e087d35a514b8b035bf7d589b2a03648245bbe05ed3f7783fe
font_02_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 11644 bytes
SHA-256: 3843d12fdeb0a6a70b42c5e645229bc6c024b05021d5b78254f7b3447e352bd1

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