Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1a375b69021e65…

MALICIOUS

PDF

68.7 KB Created: 2020-11-30 06:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 78adce3093da330445fd0eec38036d6a SHA-1: 1c8efc910997e5b0ff4aa0ae5ddbf752247f35da SHA-256: be1a375b69021e65168d60dea72b4c53ba64530558e2eaf55b5467ce9b7ace35
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a significant number of external URLs pointing to various PDF files hosted on disposable domains. This technique is commonly used to distribute phishing content or redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

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://trafficel.ru/123?utm_term=the+legend+of+stingy+jack+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492897/normal_5fabce9264d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8e9232e70d8.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/degip.pdfIn PDF document text
    • https://mibujisoj.weebly.com/uploads/1/3/4/5/134525757/2156372.pdfIn PDF document text
    • https://xaxexapiro.weebly.com/uploads/1/3/1/4/131453807/pudun-kabevelej-pigudeda.pdfIn PDF document text
    • https://kuguzozivef.weebly.com/uploads/1/3/0/7/130739994/7907579.pdfIn PDF document text
    • https://veforolafumokiv.weebly.com/uploads/1/3/4/3/134340642/tozuwujamoxipote.pdfIn PDF document text
    • https://vapuwunenerupig.weebly.com/uploads/1/3/4/7/134727873/1408426.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/1700454.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/6ebe8a4d9e.pdfIn PDF document text
    • https://mibakadediwo.weebly.com/uploads/1/3/4/5/134584598/kunavipenad-sikax-duxodejosebedep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_5f9a0f7625017.pdfIn PDF document text
    • https://suvewuvasalu.weebly.com/uploads/1/3/4/7/134762181/153bfb.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/6329394.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/30b584f866.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
    • 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_off0000c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC436 5352 bytes
SHA-256: a9d7baf99efc9eee45011ae76b3513519242836edeb36eee7ac74086c24ad8c3
font_01_sfnt_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 9720 bytes
SHA-256: b4dca8541f43c2a716d17d7b30e64abe4b0c5f77867818e06a4bd4144b550531
font_02_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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