Malicious PDF — malware analysis report

Static analysis result for SHA-256 167d35d224155aa0…

MALICIOUS

PDF

73.3 KB Created: 2020-11-24 15:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7870b85b3089f2bffce26fdb4f00d875 SHA-1: bc8b33a65fa63b5825769392b11fc1422b5d1b76 SHA-256: 167d35d224155aa0ed8a754748d8046ba12ce9b2b49984879eaa24549ccec796
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier also returned a high confidence score for maliciousness. No scripts were extracted, and the document body was heavily obfuscated, preventing a detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=khrysalis+quest+tree PDF link annotation
    • https://sasegedowitigi.weebly.com/uploads/1/3/4/8/134895647/vedilalutumof.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/lodaxevizisufuvaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5f9b67c2db46a.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/c6c9fe7ad41f6e.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/ea70fd2d.pdfIn PDF document text
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/bagut-fatujabirapir.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/18dff49.pdfIn PDF document text
    • https://lebotisoko.weebly.com/uploads/1/3/4/5/134597635/waxowusejuper.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/3684a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5f93e69c11ce1.pdfIn PDF document text
    • https://garupiripo.weebly.com/uploads/1/3/4/3/134386314/wuvapavoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f9d61e39ab24.pdfIn PDF document text
    • https://gororumemi.weebly.com/uploads/1/3/4/5/134517819/85529.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/97cf48b8-7f07-4845-9567-5fc19c388fc0/harga_monitor_lg_flatron_l177wsb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2304eb-62d6-434c-a60e-23ac7dbd3d1e/2229309118.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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 4968 bytes
SHA-256: 76ce4540eaa44024cdb134cf7d782f158989c42223da57caed330298125a5d69
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 10896 bytes
SHA-256: 2022c1ec3d77036332ec53fd08e846051b0b82b7598b0b84d453df0ff4e0e78b

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