Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53b1c9b6cabb552…

MALICIOUS

PDF

61.1 KB Created: 2020-12-15 01:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 172e9ec052376e202fc2a64e32a80afe SHA-1: 8780a0560859101e5d65c21fb9960c6ff71768a4 SHA-256: b53b1c9b6cabb55247e559b442f6a0aa004be5cd578cface37aeeb5c8801777b
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. The presence of a known malicious redirector URL and a critical ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=lifeline+exercise+mat+pro In PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/gulividizo_gopud.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/tifidedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_5f9ef2acc6f59.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/gizukajivili_jatobijifedi_lusobijavado_lamav.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/difipel-fubibopizabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476952/normal_5fb278ffc9d2f.pdfIn PDF document text
    • https://gajokemijibefe.weebly.com/uploads/1/3/4/4/134467094/tugofeda.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/6435199.pdfIn PDF document text
    • https://getomipo.weebly.com/uploads/1/3/4/4/134403721/ritejevi-bibubabugegasur-dikaralemo.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/garovo-tokivog-tivujuvu.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/8c4ede23-2947-4d2b-a158-90fb029dc70e/benaketiwuwefiponux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5d11fa-a262-486c-96c6-cbecbfba5abd/what_does_the_dragon_ball_symbol_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a50c78-2790-4192-afef-f43060bb6211/92667192795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc3f4e4-6ade-4516-b2a0-c7780ee6704f/67583669523.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc293fe0b6b03258f403ad0/t/5fcf929c69d6d06d5545e603/1607439005853/pet_doctor_911_reviews.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e8305687f52b6b812c21/t/5fc12a413570fb44d12cd99a/1606494785444/morongo_indian_reservation_map.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_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 5168 bytes
SHA-256: 37e0d3528c0b80e0f376b85f3cf3f573bd3e74b2a425b58b834ce99688cccc0b
font_01_sfnt_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 9680 bytes
SHA-256: cfe67f24e56f811e1dd63a0a53b212ef7f1d3cef97950878e95509c2cd1b6d7d