Malicious PDF — malware analysis report

Static analysis result for SHA-256 7998d1655499bc18…

MALICIOUS

PDF

74.3 KB Created: 2021-03-23 00:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7225aeda8b3b3c285f0286d1b46207be SHA-1: 530828a00451538d8b7aebc73a4f0c20f1135b2f SHA-256: 7998d1655499bc18ae3b9ac439eb9624ab9737351b154f90904ada84a96bba7a
156 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with many URLs pointing to seemingly unrelated PDF documents. The primary URL, 'https://jacksth.ru/wix?keyword=bloodstained+witch%2527s+tears+farm', suggests a keyword-based SEO manipulation or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=bloodstained+witch%2527s+tears+farm
    • https://cdn.sqhk.co/wifenepomojo/zWibigy/color_by_number_free_printables_minecraft.pdf
    • https://cdn.sqhk.co/tamikoveken/igjehha/jusape.pdf
    • https://cdn.sqhk.co/xokebuzizo/SKgeHib/zombie_hunter_king_game_install.pdf
    • https://cdn.sqhk.co/buvaboda/jjggcjb/patriot_off_road_camper.pdf
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/4a9eb99dc992f6.pdf
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/54474a2846.pdf
    • https://cdn.sqhk.co/vedimofaw/LtXjbAY/flappy_bird_creator_tweet.pdf
    • http://rejinijajelu.22web.org/25996573591.pdf
    • https://xowemaxixedire.weebly.com/uploads/1/3/5/3/135325030/lewusokuduwom.pdf
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/zojewa-levopiwara-zututakobomana-gidipomat.pdf
    • https://jiromozuno.weebly.com/uploads/1/3/5/3/135387519/7a1cd661fe66.pdf
    • https://kajipeluvo.weebly.com/uploads/1/3/4/3/134318391/kavigamel_lanuxixow.pdf
    • http://texulateniz.iblogger.org/36536196688.pdf
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/mojak-buredataw-jakifowikego.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/84f25eea-6657-4d85-9186-90170475a80d/22309908606.pdf
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_8a80c0c6cc2e46c48738ed23bbfc6724.pdf?index=true
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_3eafd2a01a1f459a9115c3a4f4069d57.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ce7ac43a-6bda-4f9d-908c-8355e5896b06/uniden_bearcat_bcd396xt_programming_software.pdf
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_13ef8fb7ffdb4c7a80054b8d2982a221.pdf?index=true
    • http://xanawuvogi.epizy.com/apertura_comercial.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e303.bin
048e302e2f7631183289da6117f699f0aa56b333526d54e11163998b52d0ab6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 5436 bytes
font_01_sfnt_off0000f56c.bin
7bdfe17f542bed4ac56a57758eb5dced11ba6c63ca9eac605c336e506974df2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 11288 bytes

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