Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f81269245ce9e9a…

MALICIOUS

PDF

82.0 KB Created: 2021-03-20 07:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 278d63613ef254e8d159c74a97a8f954 SHA-1: c02740998926436d7cd8d9b495cdc71674287e94 SHA-256: 2f81269245ce9e9aeb237e4dd1ff8939531aea715ad1c6920aa62f2219a5c508
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, contains keywords like 'Rabbitmq interview questions' and metadata indicating it was generated by wkhtmltopdf, which can be used to create documents that mimic search results or legitimate content to trick users into clicking malicious links.

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=rabbitmq+interview+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379485/normal_604133734ebf3.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/how_to_treat_childhood_trauma.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/7341325.pdfIn PDF document text
    • https://tinulesuse.weebly.com/uploads/1/3/4/6/134689832/9a05cb2a190.pdfIn PDF document text
    • https://kobuzefejara.weebly.com/uploads/1/3/1/4/131437799/waxigamimu_doviforaku.pdfIn PDF document text
    • https://wagelefukat.weebly.com/uploads/1/3/4/2/134265927/wimirijixugoxop.pdfIn PDF document text
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/6cc04ed015.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/jobasidifan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_60017838a0dc6.pdfIn PDF document text
    • https://xagaxomopezegif.weebly.com/uploads/1/3/4/3/134355140/c12030d3.pdfIn PDF document text
    • https://sivesasa.weebly.com/uploads/1/3/4/6/134669324/mejir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_fdbf1e5251f245eba48e6f8ef8de468d.pdf?index=trueIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/xepawanepenixiruj.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_7e47e10b112c48d888c126aa51b66b87.pdf?index=trueIn PDF document text
    • http://romapubimowa.onlinewebshop.net/marathi_famous_books_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17598ce0-c36d-4559-840a-60beeb6f2935/pentair_intellichlor_flow_switch_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa1206c-42a2-4c57-9f77-79e267027fa9/cfa_level_1_exam_paper_pattern.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_42863091773040ad823296ec937117d5.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_75f43c6bad934d05a3ea63802dbc0a26.pdf?index=trueIn PDF document text
    • http://zipemoluligera.myartsonline.com/nabuwizubi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 5104 bytes
SHA-256: bfe6c603a94d914bcda02bbf7b86feb365de73a4e869142795892ecd9b8781ba
font_01_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 10704 bytes
SHA-256: f3be98df70d0918b858d7aa59e336c27a3ab367305ccf46a8af571a8c573d4a2
font_02_sfnt_off00012c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C81 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333