Malicious PDF — malware analysis report

Static analysis result for SHA-256 211e6caa1cf37c1a…

MALICIOUS

PDF

79.1 KB Created: 2021-04-11 16:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 42aab250224f1b2e239e4a41d710bc72 SHA-1: 25c3e0ac5dbda523cbebed8d161d773f8d5fec18 SHA-256: 211e6caa1cf37c1a24758669f686f4a79407f376b31d5550ef28221a149776dd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. One of the primary URLs, 'https://baarspo.ru/strik?utm_term=what+size+screws+to+mount+sony+bravia', appears to be a lure for users searching for technical information, likely to distribute malware or conduct phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=what+size+screws+to+mount+sony+bravia PDF link annotation
    • http://seamanygau.best/what_age_is_inkheart_ford0hbe.pdfIn PDF document text
    • https://cdn.sqhk.co/jejekije/chbEbjf/king_of_thrones_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/25dimhE/pidugewegezifemetepi.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/jUzggKW/hill_climb_racing_2_best_car_to_upgrade.pdfIn PDF document text
    • https://sonefuvik.weebly.com/uploads/1/3/4/3/134325549/3648684f5.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/9fc7c.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/Jhchgyh/jananetujoxomomiwapuxubu.pdfIn PDF document text
    • http://lnstagramoriginal.com/649615441366q63z.pdfIn PDF document text
    • https://birifaxita.weebly.com/uploads/1/3/4/7/134718336/ab1ef68ce16.pdfIn PDF document text
    • http://drive4mclaneaustell.com/classifying_angles_worksheet_grade_4g7900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8963ce-a285-4928-9fb3-18ef28a228df/ap_english_literature_and_composition_question_2_prose_analysis_2019.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_47a68ea6f4dc4cf7b3f113b1aafad1aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1fe7b3-afc7-400c-97ff-db7d283b6c39/vedepevem.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_bdc8d33bd6334ef6973cc415cfe705eb.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_f1d48683e0a24eb1b61f9f54d650675a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/cheat_engine_6._7_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48947ad9-47e9-4786-a6ad-81aaac800077/budosipigepalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52a1943-df81-45cb-815d-e417b29c5d18/xagerin.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/viper_alarm_remote_7345v_manual.pdfIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_68d1f59b23a448318e0eb806d21034b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b03433-a518-4596-8596-d868c3569225/sumiwixex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 5464 bytes
SHA-256: 15fac3b00913943419b22acc82e99f65152de17e1da69f873b90429ee7127528
font_01_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 10816 bytes
SHA-256: cc923c514bf32e606ae0d63ca2fa037f480c11d3b75a5592504dc0b5ecad5ac8