Malicious PDF — malware analysis report

Static analysis result for SHA-256 407936887970142c…

MALICIOUS

PDF

77.5 KB Created: 2021-03-25 08:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8a8c8feb982e980789b873150c867af SHA-1: ddddf84ee1fc65e398c27f73ca936cabbaa53ac2 SHA-256: 407936887970142c556a98c0a64ee1aa831645a4520e9337a23d1028635330a4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it's part of a link farm or SEO manipulation scheme. One of the extracted URLs, 'https://botokaw.ru/strik?utm_term=long+run+total+cost+curve', is a primary indicator of the malicious infrastructure. No scripts were extracted, but the presence of numerous external links points towards a phishing or redirection attack.

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-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://botokaw.ru/strik?utm_term=long+run+total+cost+curve
    • http://kuvenumine.mygamesonline.org/define_developmental_biology_evolution.pdf
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fc63ca7d829b.pdf
    • https://kopabiziruzoxol.weebly.com/uploads/1/3/1/4/131406592/xajexugakumiluves.pdf
    • http://rarurude.22web.org/tamilrockers_2019_hollywood_movies_tamil_dubbed.pdf
    • https://wofovadorobonam.weebly.com/uploads/1/3/0/7/130739883/2706007.pdf
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/7827584.pdf
    • http://babozim.22web.org/neonatal_hyperglycemia_guidelines.pdf
    • https://cdn-cms.f-static.net/uploads/4387421/normal_6023c1c921370.pdf
    • https://rovemijiv.weebly.com/uploads/1/3/4/3/134343091/wagapiz.pdf
    • http://dobuwiwitevotir.sportsontheweb.net/zefomekivegenoxopudopaza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/06e1fe2f-7d27-4e9b-bc9e-76c0743063e5/troy_bilt_trimmer_mower_5hp.pdf
    • https://uploads.strikinglycdn.com/files/a06d9011-746b-4f2c-ad73-a060372a423a/2011564587.pdf
    • https://uploads.strikinglycdn.com/files/9b6f4647-b33a-481a-90fb-4917aca4ac59/ruvejazowexopagopafozu.pdf
    • https://uploads.strikinglycdn.com/files/63a05e1e-9ad9-4954-aab2-d46e101629b5/79755481699.pdf
    • https://uploads.strikinglycdn.com/files/a219e0b2-9059-46d8-a5f1-139f9f5682f6/75706949805.pdf
    • https://uploads.strikinglycdn.com/files/23e5f6a5-4c99-4a1b-817e-2e5d7d1506c0/how_to_calculate_mean_on_ti_30x_iis.pdf
    • http://podazowek.epizy.com/wowikavu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cb.bin
d77a213bca35e103b8280bd9da01ebb0b60c841576fa30afb52207d83459a8fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 4800 bytes
font_01_sfnt_off0000f634.bin
eddf449503863310349299ccf80902892ab81d865c68fc604739e9909f2fe91b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 11020 bytes
font_02_sfnt_off00011b14.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.