Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e35dbcd1f02811d…

MALICIOUS

PDF

86.8 KB Created: 2020-12-25 20:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b8a3c41685289ea55650fab114d3f9cc SHA-1: fc047a46a4e82d72b6852fbd16e581211aae5fb5 SHA-256: 6e35dbcd1f02811df094f225fe97c629ef258b124126b6dde95d6a2d29026c48
244 Risk Score
Tags
free-cdn-ebook-manual-lure

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, and one directly links to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to a chiller manual, likely serving as a lure to disguise the malicious link farm.

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://ggtraff.ru/aws?utm_term=carrier+air+cooled+screw+chiller+manual In PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/gazobudizoporu_xatodabaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5fa0b12757bde.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/Xpcgihf/93330886923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f95309d5af83.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/ruwirutub.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/9885763.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/gRmtdhe/tupakiruvumuturomak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422148/normal_5fc3b5f17ac4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fd3528d128a0.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/sisux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417315/normal_5f9c709e8e508.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/81c1877d-58de-4d3a-b2e2-a77a10ec182c/10554774592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fb012d-98ed-4705-9bbf-92b3e6515528/juluwovagotilavi.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_off000114e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 5176 bytes
SHA-256: b23450005c9283e61a91db5044d7f71e1951b0a63d6d0ba439315579a300a17e
font_01_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 11952 bytes
SHA-256: 3a1e9aaaa8879f9189ceafa71281575b169e32337710baa3f1763b344ce0e336

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