Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e70730d9ecdbdcd…

MALICIOUS

PDF

81.5 KB Created: 2021-05-22 15:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1769f3126b31faba88daf7bae1829002 SHA-1: c233367490a9fd433149f63660c89a7356887fd6 SHA-256: 4e70730d9ecdbdcd44f166c6a4a384bfde88a06bcca82db549491e775a7ba6d1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm or phishing operation. The embedded URLs, such as 'https://nipisod.ru/strik?utm_term=sin+cos+tan+word+problems+pdf', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links point towards a social engineering attack.

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
  • 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://nipisod.ru/strik?utm_term=sin+cos+tan+word+problems+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5feeaffbc0b8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_601cdc00f247c.pdfIn PDF document text
    • https://putuxukive.weebly.com/uploads/1/3/1/3/131379249/topefef.pdfIn PDF document text
    • https://letemoxitaja.weebly.com/uploads/1/3/4/4/134475957/b715d4ad8.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/bofemivigata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_6038fcd726de7.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/c464a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5fdb6da0e8418.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/xutom.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/5151b423252a646.pdfIn PDF document text
    • https://sebipujo.weebly.com/uploads/1/3/5/2/135294987/gukedadugogevanig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_602fa5ba3a4c5.pdfIn PDF document text
    • https://telamuvepof.weebly.com/uploads/1/3/1/3/131381447/lowatirigezedo_fopixigirilesuk.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/6273910.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/683f2cc9-4760-4d71-8a67-4f8beb440a45/94833271823.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/26025704644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69495dc9-c9de-4e65-a97f-f45d8cd99c30/can_you_text_on_the_jitterbug_flip_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/sowuwatakenebeke.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/kixusefewi.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_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 5636 bytes
SHA-256: a09215760ad7606ef6109c79a98c23d9967f298c705dcb0de9544dfa8dbea40d
font_01_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 11716 bytes
SHA-256: f44ebc491b42012c5f3283e6267e8fd1b99e90001b4fa0a4e9e1b3a0d29516ce

Open this report in the interactive analyzer, or submit your own file for analysis.