Malicious PDF — malware analysis report

Static analysis result for SHA-256 7877c2c1a086fcf9…

MALICIOUS

PDF

78.4 KB Created: 2021-05-14 04:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 57ed055dda8d3094e703cef13b978bca SHA-1: 547050103f0f7b0f3aa940066e57ad8dbdef6344 SHA-256: 7877c2c1a086fcf9669468abc20fb54f340451e170817efb5306bf787b7bffce
186 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 external links, many of which point to disposable domains or are used in a link farm configuration, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous external URIs.

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
  • 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://zajinet.ru/strik?utm_term=book+after+the+halfling%2527s+gem PDF link annotation
    • http://vorgazme.com/nissan_50_forklift_specs_weightn8vjr.pdfIn PDF document text
    • http://vsedlyatebya.xyz/twist_of_fate_olivia_newton_john2i8q6.pdfIn PDF document text
    • http://nigma24invest.online/789537805579cl0o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_5fe957e666fbc.pdfIn PDF document text
    • https://tofudilasikota.weebly.com/uploads/1/3/0/9/130969343/7997183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_5fe9b712a7299.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/mewapinepugivik.pdfIn PDF document text
    • https://fopilifufisi.weebly.com/uploads/1/3/6/0/136055159/purixujepo.pdfIn PDF document text
    • http://j3vnci4.xyz/libro_geografia_1_secundaria_editoriwqlyb.pdfIn PDF document text
    • http://teenagetutor.net/31941848140a0dmj.pdfIn PDF document text
    • http://mivetys.xyz/431182614433apv3.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/2e9a588f-8c5e-4051-b559-a0112cc281d4/subopebub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2834112-a0de-4dac-9acc-17bb3be0579f/how_to_change_trigger_on_beretta_92fs.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_8dac324fbc7b4a5da96856b90b96f74c.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_8b905e0e6a7848269ab030f912cfd3fa.pdf?index=trueIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_7d5bc494835348b88080d643bfda7876.pdf?index=trueIn 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_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 5328 bytes
SHA-256: 341c7b1284ad944175af9dd0cbe704a18da7c3ac663b49aefe7b73a9b7d2e12b
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 10912 bytes
SHA-256: 84143bfea99cd0a7a747743c357755eb9e8da97ebb47063326822ef79ba409f2

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