Malicious PDF — malware analysis report

Static analysis result for SHA-256 4891998dc1630141…

MALICIOUS

PDF

80.7 KB Created: 2021-03-21 21:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 689ccadcd418a781c581a8f183370e0e SHA-1: 63dc8fd4ca8914ed7c1ac8827775bc115803f24c SHA-256: 4891998dc1630141dbac821a22ebe1228f6dbdaadf5ca31f8aacbef6408e88e8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, including one pointing to 'bologen.ru', suggesting it's part of a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/aws?utm_term=how+much+rice+yield+per+acre PDF link annotation
    • https://cdn.sqhk.co/togodawexu/bhfjaE7/country_gold_the_greatest_hits_of_all_time.pdfIn PDF document text
    • https://kunefenirubineb.weebly.com/uploads/1/3/0/7/130739500/5893140.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/jbia1he/drill_master_4._8v_cordless_screwdriver_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/ghiaQih/annoying_ads_popping_up_in_chrome.pdfIn PDF document text
    • https://cdn.sqhk.co/gojapawareke/ridkShc/kikofedubajajalulimitubok.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/icQjaUx/xotewez.pdfIn PDF document text
    • https://vosanodamenero.weebly.com/uploads/1/3/1/4/131438282/vulofovukebenil.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/ijThaZc/41260115758.pdfIn PDF document text
    • https://tinuvireredat.weebly.com/uploads/1/3/4/8/134864568/begigijedotu_xaxufatene_xudazifitajagij.pdfIn PDF document text
    • https://pakupefo.weebly.com/uploads/1/3/0/7/130776676/dda3dd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/tavufopemomin.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/13550205448.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/wanimupabitavobipuguvop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/654414b5-3bcf-4a86-9f89-c59ecbc8a6b6/how_many_calories_in_bojangles_supremes.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/bumper_sticker_template_illustrator.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/74300137084.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/57072818526.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/zasumotikakuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a313385d-7e64-4ec4-bf94-e3c930485532/33025763316.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/tijavuwamawuxoro.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_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 5292 bytes
SHA-256: f5206e15b532b6f23ba94f66994ecf6e8c210d08ae75975b4b7712da2a19b975
font_01_sfnt_off00010f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 10632 bytes
SHA-256: 39a4516b7679fb1b80b0b369e52f7707e41d2751952218a2ff0dfb5da0da53fc

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