Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb502c2a1d48a64…

MALICIOUS

PDF

66.7 KB Created: 2021-03-08 23:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 906b4f6db175ce70f7c1916dc152e456 SHA-1: a86710c0a241c46b34a4dcf198675203048c26bb SHA-256: 5bb502c2a1d48a646c6b1edeac8cc628db09707f120590fca8dad1a3c8476cf4
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including critical alerts for malicious redirector links and a link farm. The embedded URLs, such as 'https://crophysi.ru/strik?utm_term=weller+8200+soldering+gun+replacement+tips', suggest a phishing or spamming attempt. The presence of numerous links to disposable hosting services further indicates a malicious intent to distribute harmful content or redirect users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=weller+8200+soldering+gun+replacement+tips In PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/sejorus.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/9aa71.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/sujovasuxulijimaxapa.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/lafenigu.pdfIn PDF document text
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/zupoxijozujese.pdfIn PDF document text
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/3ada0f.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/hbsaAwC/easy_world_history_trivia_questions_and_answers_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/hehd0hG/51286907025.pdfIn PDF document text
    • https://gavuwexis.weebly.com/uploads/1/3/4/7/134772394/benelokorol_wumuga_vojitululukiga_zoluwipev.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/lareke.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/star_frontiers_races.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/9d38780a-5941-4c6d-97be-a66cd2a8c0b5/lord_of_chaos_castellano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38522590-b3cc-409a-9760-c4fbd87b4bb7/pride_and_prejudice_elizabeth_quotes_on_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe488904-0d1c-4fa6-8818-f7ec3ef2a0a7/photoshop_cc_2017_tutorials_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b921f9d-7b6c-442b-a7ff-0e9ac221ec53/38253088489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf43b81e-af9b-42e5-b940-6da1c5b7bec2/17520780219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33da3b3d-6537-4ebc-8688-3aae4435e383/tuzinupekatavasaro.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_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 5876 bytes
SHA-256: d573cb9cdf3166dd5db9b420156852511d6e46ec2556595c882a6993aabdddf7
font_01_sfnt_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 9896 bytes
SHA-256: 359bb8c74cbbb55e5162bec5278c221e27ab33fdb5c0f1fa2c03d69686932056