Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7412771c73bfbe…

MALICIOUS

PDF

78.2 KB Created: 2021-05-17 07:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f8f38b44b84aeafc29c143c02823b3e5 SHA-1: cb99388852d4f73aa29b3a46635f77102d48d3c4 SHA-256: 5e7412771c73bfbe1143495857fdb1ddf925871f21ec3233fd7563d7586ed4d9
186 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or SEO link farm attack. It contains a large number of external links, many hosted on disposable domains, designed to redirect users to potentially malicious content. The document body is heavily obfuscated and appears to contain junk data, further suggesting malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=does+domino%2527s+pizza+use+msg PDF link annotation
    • https://cdn.sqhk.co/noperizapewo/hh7aO2I/overkill_s_the_walking_dead_steamdb.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/6681441.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/ZRidTid/dominos_wake_village_tx.pdfIn PDF document text
    • https://ririsibonegibo.weebly.com/uploads/1/3/4/5/134596323/9131671.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/vadinakapolud.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/iiAgfjc/16764299981.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/nivolip.pdfIn PDF document text
    • https://cdn.sqhk.co/wenisuvuroju/aGgjTlO/rizirixi.pdfIn PDF document text
    • http://dosefokinuvulo.mypressonline.com/68698121172.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/djbgfax/calculator_soup_rounding.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/66408418954.pdfIn PDF document text
    • https://cdn.sqhk.co/vabedesi/6EvBiaA/bojeselavanazivejowigifop.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/Mhexggh/tesotokaboxuxetenakekiro.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/khfibha/big_bang_theory_show_science_facts.pdfIn PDF document text
    • http://sewukagazub.mypressonline.com/motivation_letter_for_a_bursary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketabigumowun.atwebpages.com/family_feud_game_template_for_mac.pdfIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/gasuroxodi.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_f01a08c497784230936c0f269ff78dc8.pdf?index=trueIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_17c8a74c2405421b898d7fd7df74b99f.pdf?index=trueIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_bdb3531808fe4964a55c2cb1793bf044.pdf?index=trueIn PDF document text
    • http://solarujarinobo.myartsonline.com/jedura.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_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 5236 bytes
SHA-256: d36884aa5dbe7beab637191608296bc9b46433d63b5fd40c2d7b0d27838b8c1f
font_01_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 12052 bytes
SHA-256: bf3cc9ca049ea789d2d539fbbd11b22dc93d86815742e6aade1f8d76231a6982

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