Malicious PDF — malware analysis report

Static analysis result for SHA-256 6793574b88172942…

MALICIOUS

PDF

95.6 KB Created: 2021-03-24 03:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 034ea1a4bf9391e51fa7e516510d4d77 SHA-1: 5f69dd936748b8ebb90d467e7d087610d2f71d72 SHA-256: 6793574b88172942fe2209a8f1a7bcb1155659f8445bf869e5188bdeecd51c05
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV 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 potentially malicious content. The document body, though truncated and obfuscated, appears to be a lure related to 'analyzing graphs of functions worksheet pdf'. No scripts were extracted from this sample, but the presence of numerous external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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://lozipotod.ru/123?utm_term=analyzing+graphs+of+functions+worksheet+pdf PDF link annotation
    • http://vazosuzited.22web.org/fha_guidelines_on_medical_collections.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/36557300014.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/blood_relation_reasoning_questions_with_answers_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/iGjf7ia/world_time_attack_aerodynamics.pdfIn PDF document text
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/vifezaxewegomebopawu.pdfIn PDF document text
    • https://gafeziluwer.weebly.com/uploads/1/3/4/3/134310472/5588829.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/keperebe.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/fifhegd/sexafom.pdfIn PDF document text
    • https://wilaruxade.weebly.com/uploads/1/3/4/8/134865150/6a783cbd5755e45.pdfIn PDF document text
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/zegasukewaluwamikar.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/what_is_a_heavy_rainstorm_called.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/943a224382c3267.pdfIn PDF document text
    • https://vumiwexazowonig.weebly.com/uploads/1/3/4/6/134680765/8527534.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/3485447.pdfIn PDF document text
    • http://jinijazutafenix.22web.org/diy_baking_sheet_storage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_6f53d3b911454437a0fadae6157917e0.pdf?index=trueIn PDF document text
    • http://fazobelo.onlinewebshop.net/15983358651.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/does_bosch_make_the_best_dishwashers.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_d1c2be22f4204925b224303a2376c9a1.pdf?index=trueIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_97e08a924edd4cb08dcecf8a235a4085.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_064857daee404ecd90d522a3a0960b86.pdf?index=trueIn PDF document text
    • http://degepedafapuf.epizy.com/guardian_bard_guide_aura_kingdom.pdfIn PDF document text
    • http://jatuxijor.epizy.com/63828677260.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off0001200f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 5716 bytes
SHA-256: eae2f3bbc170a391f63d5732df33fe2363638814bd9a5150bb3821e356ace3c8
font_02_sfnt_off000133ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AC 11356 bytes
SHA-256: ecaf168e19ceab41c29b4aaab9d6dfe7d49cadc9bd6a5c62031c1453b63449e6
font_03_sfnt_off00015aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA6 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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