Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c5f1c6d7417f9b…

MALICIOUS

PDF

78.0 KB Created: 2021-05-05 16:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0112034fabae46fe585d85e114b065fa SHA-1: cddcdd9c1b6421011f7b513971244d9c948f535b SHA-256: 73c5f1c6d7417f9beeb4b8c318a3b1bf54f27e48674ed49525c6098164060e76
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to various websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ClamAV detection and ML classifier also flag this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://yafferge.ru/wb?keyword=alesis%20midiverb%204%20manual%20portugues In PDF document text
    • https://felipivi.weebly.com/uploads/1/3/1/8/131856333/supogozok.pdfIn PDF document text
    • https://modofanapaf.weebly.com/uploads/1/3/4/6/134676621/tetalosusame.pdfIn PDF document text
    • http://sberbank.services/933300110108js24.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/0a9f1efe19.pdfIn PDF document text
    • http://vekvelo.ru/insignia_converter_box_remote_codespgqbq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_60288782aa6e9.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/790933.pdfIn PDF document text
    • http://lnstagrambusiness.com/63688599311ifvg2.pdfIn PDF document text
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/6101857.pdfIn PDF document text
    • http://x-bionic.shop/dna_rna_and_snorks_drawingossol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_601d5bfe7d3e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423136/normal_5ffd1caf4ea41.pdfIn PDF document text
    • https://loxerujose.weebly.com/uploads/1/3/0/7/130775489/bae1d63.pdfIn PDF document text
    • http://private-channel.site/integration_of_hyperbolic_functions_worksheetl98b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_60145cdd15046.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/5e824be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5fe39e32c358c.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/6a152de7-ab0c-4583-b393-3f81d250fbe7/mossberg_500_ati_tactical_scorpion_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2059b7-9300-4008-89de-a4d24d222bf6/tobipedavonebabejoz.pdfIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_adf9dad964e7485cb99595a1c93256fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b846444-0daa-453f-b122-911ea21c57ad/6378758775.pdfIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_cf22fd6dce2944bba4683bb550a90c4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c5caef-0351-4400-80b4-ce4aa0ebc26c/51251593950.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_b8183cc0577345c7bcff50273256b158.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_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 5556 bytes
SHA-256: e67771c80f2635c248f0deb4b8040b3ac8615bb59eb0d90d9629c9881edc5713
font_01_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 11808 bytes
SHA-256: aac3088027ae65fbdd5c079ed019a3a4e3baac7b70b672473dd510830303d275

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