Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f452dcd698e319…

MALICIOUS

PDF

75.3 KB Created: 2021-03-04 20:24:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 35390befeb8abdb1ac7100c0b5e64375 SHA-1: ae4f7c3cd9400176cc39d129e2dabd9c2429baa4 SHA-256: 57f452dcd698e31938e03360db9baff409e75b832720de371fa9ee235b81e018
184 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=identifying+the+main+idea+and+supporting+details', which is flagged as critical. The document's structure and embedded URLs suggest it is designed to phish users by directing them to potentially harmful websites. No scripts were extracted, but the presence of malicious links is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=identifying+the+main+idea+and+supporting+details In PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/1a4c06e4b7cc5f.pdfIn PDF document text
    • http://prodson.fun/formula_car_racing_mod_apk_unlimited_moneyc8j6a.pdfIn PDF document text
    • http://dom-bita.org/zubofapomugukuwefegud8un2m.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/nike_air_force_1_utility_real_vs_fake9bsec.pdfIn PDF document text
    • http://hookup671.site/what_is_visual_perception_in_simple_termsss8rx.pdfIn PDF document text
    • http://usblighter24.site/damelugosevamogivokt4ohd.pdfIn PDF document text
    • http://renatoxun.iblogger.org/lezezusarokozazo.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/8688153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_7804fa055af74887b02b516c33f4a3ca.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_3e91fb48da9940dea9ce0942d5934d02.pdf?index=trueIn PDF document text
    • http://pimibini.epizy.com/iifl_wealth_annual_report_2018-_19.pdfIn PDF document text
    • http://gizamowamuvo.epizy.com/star_classroom_login.pdfIn PDF document text
    • http://kovejenipo.epizy.com/belaseshe_full_movie_720p.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_1c7587498f884ea3b37198d9e0a780d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcbb487-d50b-4d9b-9a56-7cf1d9c6911a/monopoly_rules_money_pounds.pdfIn PDF document text
    • http://gidepajujida.rf.gd/pexunozedenitukonegofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a271232-ad61-4d2d-a4f4-5647294ba9f6/nubibunukufaluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e6a093-4e0b-4ded-825e-b18e194bce59/12149728431.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_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 5492 bytes
SHA-256: 59b8628c8940e8bf1645737627d57f14d7fa68b760d1f93f4e2438d2b5c49fa8
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10768 bytes
SHA-256: 39c6380909d9f746429672a56c24d999f968f3ae77b1e1acde47254811c741f2

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