Malicious PDF — malware analysis report

Static analysis result for SHA-256 21038584566920a4…

MALICIOUS

PDF

70.2 KB Created: 2021-03-26 10:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3cf790cb4d07a4e73d1410e99617abe8 SHA-1: 07e16e58e8f8a73dde54fb34c746fa761ad4da7e SHA-256: 21038584566920a46dc66e71bf567cbd0ab3c8104d85fed68c649824458b6d4e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to redirect users to malicious sites. Heuristics indicate the presence of malicious redirector links and a general phishing/malware classification. No scripts were extracted, but the structure strongly suggests a phishing or malware distribution lure.

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://yafferge.ru/strik?utm_term=they+say+%252F+i+say+4th+edition+with+readings+pdf In PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/wuwotujop.pdfIn PDF document text
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/gemokovadopitidixeg.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/retaporavofep.pdfIn PDF document text
    • http://gidilakapajuke.mywebcommunity.org/10992080315.pdfIn PDF document text
    • https://jelebemurufipo.weebly.com/uploads/1/3/4/4/134442628/6082925.pdfIn PDF document text
    • https://rinuxusopav.weebly.com/uploads/1/3/4/6/134679155/2576584.pdfIn PDF document text
    • https://rulofobu.weebly.com/uploads/1/3/0/8/130814337/tezapodijovilu-malawa-magudekifiko.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/apc_back-ups_xs_1300_lcd_manual.pdfIn PDF document text
    • https://sujefamop.weebly.com/uploads/1/3/4/7/134762109/4f47357eba8.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/f4f5acdf-1f75-4e98-b5df-01629999f5c3/xedolekepefutexer.pdfIn PDF document text
    • http://jijetebum.epizy.com/48832796184.pdfIn PDF document text
    • http://vanomuwoz.epizy.com/pexebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5b17ef-4735-41d9-a66e-2d384408c860/75836017415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e109225a-25ce-4e5c-8c43-05ef295be234/55421590801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657ad8f9-bbaf-438a-bcb1-2cdbe88548e1/woletuxifetufoxivovumap.pdfIn PDF document text
    • http://widusop.atwebpages.com/37612299056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ecc4579-1590-42b1-ae86-1ca9d620c8f2/530790343.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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 5540 bytes
SHA-256: a6fb8b9cf9bea6ee8e4fa523b76566bab17a4e2895722790ea19b7cb88fca861
font_01_sfnt_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 10716 bytes
SHA-256: 83a85aaba8f8eae4321e9556e04d45082a8403dc2f5f18c866098162deb038da