Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8821948f51ba74…

MALICIOUS

PDF

75.6 KB Created: 2021-03-13 14:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d845d5f46bc6ec38b32b3dcf94af578a SHA-1: fe055de1a1c903fe2d385e8be256271d6079b20f SHA-256: ff8821948f51ba743ba05f42bdc3aa8cbd6730742089703c186c5d11c0b85d47
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 or SEO spam campaign. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or link-farming attack.

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
  • 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://resalured.ru/wix?keyword=kodi+ps4+plex PDF link annotation
    • http://lewuvajenajen.iblogger.org/what_are_the_steps_of_career_development.pdfIn PDF document text
    • https://cdn.sqhk.co/tizalenifo/lgfyGij/happy_wheels_online_download.pdfIn PDF document text
    • http://discount50.pro/how_many_calories_in_a_dunkin_donuts_vanilla_chai_with_skim_milki91nh.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/PAZaCic/anger_of_stick_hack_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/v9gjjgf/94577928778.pdfIn PDF document text
    • https://jemikarabon.weebly.com/uploads/1/3/0/8/130815017/taranodavijaz-monidodiku-kagodipenemiga-ludejesarel.pdfIn PDF document text
    • http://bu-markett.com/45306695461yufmv.pdfIn PDF document text
    • http://getsalon.xyz/exercices_de_maths_5me_enchainement_doprationidh3v.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/5726038.pdfIn PDF document text
    • https://rowozone.weebly.com/uploads/1/3/2/7/132740293/wujamifurozed_romavu.pdfIn PDF document text
    • https://nobozufale.weebly.com/uploads/1/3/4/3/134322784/263027.pdfIn PDF document text
    • https://bobusenig.weebly.com/uploads/1/3/4/8/134866704/2571220.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vurorevebosexu.rf.gd/hmdx_rave_bluetooth_speaker_hx-p205a.pdfIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_8becd3463d76482ca209030920bddda1.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_6c456fc969e14b2e80868a6ffe66e54d.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_b9297ac4430f4e75a97da77767f752a1.pdf?index=trueIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_41e7eccf1faf44d186d7ba7f59d11d7a.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_5be1559192f5421f82090cbf3b8ea18a.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_3a1f8d0d3bd14ac284b285d5daf26752.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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 4772 bytes
SHA-256: b9b82ef399792dbd7594ce8c73ed96a1816c6b2d0d89eb1c95836ca11a7f55b8
font_01_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 10604 bytes
SHA-256: 57c53ee0b42b69c02e9853d03fde3d2e67875bfeea40aa8cc70c68acf8122426