Malicious PDF — malware analysis report

Static analysis result for SHA-256 90458765ab551e1a…

MALICIOUS

PDF

94.7 KB Created: 2021-03-14 17:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ce7dead76cb90231b3ebef6fd101f261 SHA-1: 2553904ad058c95facdb67d0306ea544aad1d243 SHA-256: 90458765ab551e1a82b07ecf2086d03360958356e3bd7ce92027797ff37a77ff
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with several heuristics flagging it as a link farm and a potential redirector. One critical heuristic specifically identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/123?utm_term=live+sports+apk+firestick In PDF document text
    • http://gatorama.space/how_to_pass_med_surg_certification_examloev3.pdfIn PDF document text
    • https://jepemanek.weebly.com/uploads/1/3/4/5/134589705/052ff2eb18f76.pdfIn PDF document text
    • https://timemojorejo.weebly.com/uploads/1/3/1/4/131437846/busoroxe.pdfIn PDF document text
    • https://retibome.weebly.com/uploads/1/3/4/6/134680472/xazoxitom-jikekibadifuxe-tonararij-sonasife.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/gukosawow_vasamogonefuduf_suzakorim_fasenidulanal.pdfIn PDF document text
    • https://kutakikojog.weebly.com/uploads/1/3/4/6/134688668/xuzonor.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/vixonisepiwig_jumononokorog_nebip.pdfIn PDF document text
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/tagafutalagogexi.pdfIn PDF document text
    • https://zajutarox.weebly.com/uploads/1/3/0/8/130814803/bowirovimoz_denulivixivona_mewubigesupafax.pdfIn PDF document text
    • https://koterevimudo.weebly.com/uploads/1/3/4/3/134342185/9187137.pdfIn PDF document text
    • http://shop-profildoors.ru/314666156454z8iv.pdfIn PDF document text
    • https://nuresipaxujetun.weebly.com/uploads/1/3/4/6/134683077/sozupumoruga.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/gagagakigibapo/fatupob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b5e32f-c824-4274-b3a1-53c88b0a9893/dajusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/048d71f1-cf61-45e1-a748-e0d6c679e71e/moultrie_game_camera_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133f1fe3-e357-49d8-8df6-56ae0c13b8e2/49261073789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafad626-41b9-4b14-b295-cd9d6a277a11/44036367804.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/20886316207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cdbbc7f-96a0-44f5-baf4-16547680d345/que_significa_el_porcentaje_de_grasa_corporal.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/nutugafefirus.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/what_is_the_mood_at_the_end_of_the_raven.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F11 5044 bytes
SHA-256: c92e838383cbc380ffb52ca1bf51fbd2651da838747c207c91280ae7a12ae1b4
font_01_sfnt_off00013059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13059 11716 bytes
SHA-256: 842f62c3befccba9899ea2ba43998983d7b50427f4ac38b035bfed687ef1a43f
font_02_sfnt_off0001587e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587E 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17