Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c55616145620af2…

MALICIOUS

PDF

82.7 KB Created: 2021-03-30 16:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fe52949509d9b8c9ed5de63faf0c1b0 SHA-1: d01faf40ea668443c0b4f67902c12d9d340373ad SHA-256: 5c55616145620af25aab8485ea4a7571ba7f403da63fbfe6180e987131647e96
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or content-spinning operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to direct users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=medical+dictionary+hindi+app+download
    • http://befipekawuzader.iblogger.org/ruhs_bsc_nursing_form_start_date_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4369664/normal_605f7e0472e5d.pdf
    • https://cdn-cms.f-static.net/uploads/4369932/normal_604c9c75b3f72.pdf
    • https://cdn-cms.f-static.net/uploads/4470231/normal_60158a5227e22.pdf
    • http://tuwujunosemep.iblogger.org/lipid_oxidation.pdf
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5fc9aa3e1119d.pdf
    • http://ropikapusofune.iblogger.org/65508782800.pdf
    • https://static.s123-cdn-static.com/uploads/4376357/normal_5ff90af37c15a.pdf
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fca734ed7918.pdf
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5feb2faf21e07.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/47966ee3-c83e-4650-89c5-d088805718d2/kenmore_progressive_canister_vacuum_model_116.pdf
    • http://xaxubel.rf.gd/acidity_and_basicity_of_heterocyclic_compounds.pdf
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_a1da57463e42425e903822fbf900f7c6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a97b8d17-3796-4f8a-a866-a263561353dc/dell_2007fp_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/0ca0de9c-404d-44ff-9513-d68012e1133b/scholastic_success_with_grammar_grade_5_compound_subjects_and_predicates.pdf
    • http://bovudavibivutu.epizy.com/aradhike_song_lyrics_free.pdf
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_adb81d3b27f846a29ba4ca6b32c82450.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5220f59a-73dd-4d62-911f-be2fee0f9efa/treadmill_sole_f85_review.pdf
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_c7cf07a703c145649495c41c61215121.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5b7ea693-0e21-4214-a26a-b6ec66795f45/doripagijipinikugame.pdf
    • https://uploads.strikinglycdn.com/files/290aeda5-b7bb-4cc0-9af9-33d484772e1a/professors_last_lecture_carnegie_mellon.pdf
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_95d5a0a48d6c4570bb4f5d9c23c30a54.pdf?index=true
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_0bd067b57a09400b90b58035efe529f2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001070b.bin
22964c54c71d08a5408b68a2eea9bd9de539395dddab2efeb7611dc804f13876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 5180 bytes
font_01_sfnt_off000118c6.bin
89622d901c6025e6bd9160655f89e7a37c648cad56c3e0f3e92f68d86815d396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 10508 bytes

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