Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bb20b686d5542d…

MALICIOUS

PDF

88.1 KB Created: 2021-03-13 13:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 273560e9ee03314512b51ef4af0ba9b7 SHA-1: 6c7c5fe8a6c530d5eda3865516f8289561d367ae SHA-256: 42bb20b686d5542d78092b685a5f6a9234dd8a2b87203a82c0e06f4441939fad
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a link farm designed to redirect users to potentially malicious sites, including one identified as a redirector. The document body, though heavily obfuscated, suggests a lure related to "Consumo de alimentos transgenicos en mexico pdf", likely to trick users into clicking the embedded links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=consumo+de+alimentos+transgenicos+en+mexico+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_5fea0b11e4bfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408721/normal_5fef670e729dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_603e9ef15247a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482216/normal_5fc5b33a75e60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_60405ced1a345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fdfce3aba945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_5fd60e4dbc4a4.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://uploads.strikinglycdn.com/files/1f9b885c-ec68-4e52-9ace-2bc10e6c9817/how_to_scan_for_premarket_gappers_thinkorswim.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/guideline_pulmonary_hypertension_esc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9519265-cac3-4319-a275-f7f9b9902518/the_effects_of_climate_change_on_plants_and_animals.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/daziri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a936984-8f9a-4ef1-ad84-89f49e46ec4a/how_to_change_mr_clean_twist_mop_head.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43fd7f3-ced5-4cfc-ae26-da3fbefc64fe/accu_chek_performa_fehlermeldung_e9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c58137d-60f6-4665-ab60-6eb7c489866b/the_big_short_streaming_english_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8131427f-ca73-4d83-8285-f695a4aaa0e7/engineering_mechanics_statics_jl_meriam_solutions.pdfIn PDF document text
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_90e39e071aaf485fbc5458625ba022ca.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_055518f916e84a53a95e410868fc65b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/what_is_the_seat_of_your_emotions.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_f8b6c44adaaa40f3917a7145d4971953.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/badapenaxasavatemibimun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2719efc-8dd5-4872-8873-988e449c3a08/the_cat_in_the_hat_knows_a_lot_about_that.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_c3f3aaece2874e20bf3f5bea09fd1998.pdf?index=trueIn 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_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 5448 bytes
SHA-256: 2740c09b65da14bc42d444273b260125f919056b125f8010f3991f9e7659e767
font_01_sfnt_off00011b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9D 12112 bytes
SHA-256: d2e7522a1ca6715c0fbb6458853c6d9f85c2edc74e3c362f59fa987fae99ffa7
font_02_sfnt_off000142d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2