Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae6f3bfdd305304…

MALICIOUS

PDF

72.1 KB Created: 2020-11-17 14:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25e841385cb7e9f6f2023522a6175647 SHA-1: 94b8c50a17f042d8231d5241ed6582b4859b7d93 SHA-256: aae6f3bfdd3053045978dd01ed1e76f0c25d68b89ce7fef28952a84fb79b3fe3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://traffset.ru/strik?utm_term=how+to+play+fantasy+baseball', likely serve as entry points to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://traffset.ru/strik?utm_term=how+to+play+fantasy+baseball
    • https://safusubugem.weebly.com/uploads/1/3/4/6/134609944/3150500.pdf
    • https://cdn-cms.f-static.net/uploads/4463298/normal_5fad7a7c3ce74.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/bumefiruzarofeti.pdf
    • https://rolawopu.weebly.com/uploads/1/3/4/3/134317168/rubudewizuw_rikofoj.pdf
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/2f0f029bd23f.pdf
    • https://zenefuzivoxog.weebly.com/uploads/1/3/4/1/134108933/lerasiwegevasi-gojuv-wisorinu.pdf
    • https://dokarugosili.weebly.com/uploads/1/3/4/3/134362608/52e1cc2f.pdf
    • https://rutedidatares.weebly.com/uploads/1/3/4/4/134490949/07a691a.pdf
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f8a31ed34b5f.pdf
    • https://cdn-cms.f-static.net/uploads/4382952/normal_5f92b558b220b.pdf
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/xuwipumogenafid-noburopefe-nujitivu-tekepabetu.pdf
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/batapusulowujij-guniripuj-pagonub.pdf
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/8497186.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xutomoxu/netspend_activate_card_activation_account.pdf
    • https://s3.amazonaws.com/xebareto/tilidew.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d067.bin
36245cb12f0c4c7838f989eef544e520840cf16a750ff0a0ab8d293928b2854c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 4832 bytes
font_01_sfnt_off0000e0f8.bin
fded9e0380959e878e4407790f14708bc1e4abbb79d3f2ee00236d2aef6eedff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 10724 bytes
font_02_sfnt_off00010588.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 4324 bytes

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