Malicious PDF — malware analysis report

Static analysis result for SHA-256 56139044e758c160…

MALICIOUS

PDF

78.4 KB Created: 2021-04-07 09:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cabb97f46ceb89e51f4ff5c06dc9aa32 SHA-1: c6f23114c29092d31b44d8c5f593d0cf218174eb SHA-256: 56139044e758c1601060699f1f267f150193144da606d435585fc56a06c5b22a
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or known redirectors, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is weaponized to host and redirect to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/strik?utm_term=take+the+stairs+book+quotes In PDF document text
    • http://tesodip.iblogger.org/hyponatremia_newborn.pdfIn PDF document text
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/3536027.pdfIn PDF document text
    • https://vezajufarazigur.weebly.com/uploads/1/3/4/2/134265717/1969497.pdfIn PDF document text
    • https://kegovivaxik.weebly.com/uploads/1/3/4/5/134506491/940f95359c9d.pdfIn PDF document text
    • https://febapemideb.weebly.com/uploads/1/3/0/7/130738739/gopafug.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/590be4dd.pdfIn PDF document text
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/888872.pdfIn PDF document text
    • https://pikemane.weebly.com/uploads/1/3/4/7/134775920/7263746.pdfIn PDF document text
    • https://filinisosiwox.weebly.com/uploads/1/3/0/8/130814007/3231f906bce97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_4065edb3ca234bdeb99d2827f03edc28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/buffalo_soldier_book.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_9eaf61239d9c4dffa19711a6cbb234a0.pdf?index=trueIn PDF document text
    • http://rozopujonabesix.epizy.com/rovedisisok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b05cb1-5082-4bdb-8cca-8ea82293dbc5/replace_heating_element_kenmore_70_series_electric_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/dr_browns_bottle_warmer_directions.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/gidebupotosapenutuduwomuw.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/votovinanegumijiwev.pdfIn PDF document text
    • http://vaxusumimez.rf.gd/answer_that_and_stay_fashionable_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df5102d-dcaf-4339-934d-db91f176bbd5/craftsman_laser_trac_circular_saw.pdfIn PDF document text
    • http://fasekefap.epizy.com/95290515210.pdfIn PDF document text
    • http://vuxotuketut.rf.gd/agencies_of_social_control.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/68584196512.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 4796 bytes
SHA-256: ab33956e96de435da10579ec2ee09a12fcddbe834e0ee2fda703da20fa970ebb
font_01_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 10996 bytes
SHA-256: b2155d838d192544c916c004401c6087e0f43100a3fff9378161098be2beaecb
font_02_sfnt_off00011deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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