Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d4b9a9594ddc70…

MALICIOUS

PDF

76.4 KB Created: 2021-03-30 15:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 8dbea8cd76dbeff15ed28f3c0f50f628 SHA-1: ae54bbee8f4d2fc62f6a14557d1bd993904f408e SHA-256: 49d4b9a9594ddc70fb8f02b2cc567ebd9a503d96670d0258d2e4d64681be2e97
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites under the guise of search results. The primary URL, 'https://zajinet.ru/wix?keyword=ideal+gas+law+worksheet+with+answers+pdf', is presented as a relevant result, but the document's structure and the high number of distinct external links suggest a malicious intent to drive traffic to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate malicious content.

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://zajinet.ru/wix?keyword=ideal+gas+law+worksheet+with+answers+pdf PDF link annotation
    • http://gililofus.medianewsonline.com/assamese_news_paper_download.pdfIn PDF document text
    • https://mibakadediwo.weebly.com/uploads/1/3/4/5/134584598/xirudulajaduruzi.pdfIn PDF document text
    • https://bigudiwox.weebly.com/uploads/1/3/5/3/135304820/begenif-ruteris-movixodegegu.pdfIn PDF document text
    • https://savibivo.weebly.com/uploads/1/3/1/3/131381036/jekoser.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/nutricion_parenteral_en_pediatria_2020.pdfIn PDF document text
    • https://vefekigut.weebly.com/uploads/1/3/4/3/134391246/b3917bb82028fa5.pdfIn PDF document text
    • https://gagaxezoxi.weebly.com/uploads/1/3/4/7/134760548/fovaniven.pdfIn PDF document text
    • https://dodanopo.weebly.com/uploads/1/3/1/4/131408738/2884543.pdfIn PDF document text
    • https://kenojitoxudu.weebly.com/uploads/1/3/1/3/131383977/3164521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jagux/botnica_geral_wilhelm_nultsch.pdfIn PDF document text
    • https://e474413f-ff6d-4b46-a00c-d4c33541206b.filesusr.com/ugd/ddecc0_a926fdf10430433b93bff409b6b877ca.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_ec43aada6acf4a18a77d2ff02e9a45c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/whirlpool_gold_quiet_partner_iii_control_board.pdfIn PDF document text
    • http://dufojamimusim.atwebpages.com/stock_market_guide_for_beginners.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_24067bf228ac43e486b95978f955ea63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/74808013846.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_2a32d4ea56d84078b7e23a2cbd1fbf1b.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_53c2cdb70e074ce199298635c3aa0b7f.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_6c6adf0ed9a14c0ca6198ff37b30a597.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_8ed640b9f2f341ecb6b1c38d64d8798f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/70413419589.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_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 5396 bytes
SHA-256: 1ae06a569f0165b255be97aa852ab41126ceb127232899182fff6cf4939b97bb
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10688 bytes
SHA-256: d3d3762efd02c9db2d92ce6cb561de1febd887792dd8e0609985a2d04a6c78d4