Malicious PDF — malware analysis report

Static analysis result for SHA-256 789b841fffe2e63b…

MALICIOUS

PDF

75.4 KB Created: 2021-06-07 05:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1bc055f197b2301961945cec87e2efb SHA-1: c238c0dcb2e982e08240745a7b013ca591c95609 SHA-256: 789b841fffe2e63b9acac54bf0ac9f58371b77e43f0ea043203c3bf09a4c0795
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to a suspicious domain that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic identifying a link farm suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/pbw?utm_term=how+to+remove+glacier+bay+bathroom+faucet
    • https://lefakapuwowe.weebly.com/uploads/1/3/4/3/134353253/nuzuki.pdf
    • https://static.s123-cdn-static.com/uploads/4425921/normal_5ffcd17c6a868.pdf
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fe3a1b5a3b83.pdf
    • https://cdn-cms.f-static.net/uploads/4478664/normal_6018843686060.pdf
    • https://guxenakab.weebly.com/uploads/1/3/5/3/135393472/8960561.pdf
    • https://static.s123-cdn-static.com/uploads/4462350/normal_5ff30cac07d1f.pdf
    • https://cdn-cms.f-static.net/uploads/4485299/normal_602f1fb8e3e2a.pdf
    • https://tovadifu.weebly.com/uploads/1/3/4/0/134096489/dizabawavogudumimuk.pdf
    • https://cdn-cms.f-static.net/uploads/4382187/normal_601edc4f3c0e6.pdf
    • https://cdn-cms.f-static.net/uploads/4387408/normal_605c2aa23ef95.pdf
    • https://cdn-cms.f-static.net/uploads/4460680/normal_606bf5491aa08.pdf
    • https://cdn-cms.f-static.net/uploads/4461791/normal_6067412316283.pdf
    • https://cdn-cms.f-static.net/uploads/4367278/normal_6030891367e4f.pdf
    • https://cdn-cms.f-static.net/uploads/4413703/normal_60283d2fe9eb9.pdf
    • https://napujokid.weebly.com/uploads/1/3/5/3/135339673/7099971.pdf
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/buvulugibesi_fezepogi_begufotolok.pdf
    • https://cdn-cms.f-static.net/uploads/4472774/normal_60287ff4dfd3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7394207e-b790-4b80-bcb0-4764bde9f286/royal_caribbean_drinks_package_australia_prices.pdf
    • https://uploads.strikinglycdn.com/files/f272c396-4068-4a97-89e3-7d285e6fd9bb/pelicula_de_rambo_en_espaol_completa_parte_1.pdf
    • https://uploads.strikinglycdn.com/files/819f2698-7b97-4033-9c5d-0801148be5b3/39652660826.pdf
    • https://uploads.strikinglycdn.com/files/754bbefb-94d6-48b5-b977-3efa889bdc52/apc_smart_ups_2200_network_management_card_reset.pdf
    • https://uploads.strikinglycdn.com/files/462941ea-8830-4b1f-8e30-2ece71ae726f/miniature_dachshund_puppies_tampa_fl.pdf
    • https://uploads.strikinglycdn.com/files/b1930121-fea6-400e-8853-789592dc6519/59261033319.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_off0000dd4e.bin
b497c9aff69f9e82ca1a8098cab95cc252eb89349e6e036583b58552268dc9d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 5248 bytes
font_01_sfnt_off0000ef4d.bin
94c7dba493e4bcaf25c736a8ebc3808483ff37663406bd0165263bc17efe8695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 10108 bytes
font_02_sfnt_off000111a8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 4324 bytes

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