Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9b7bc842c4c8d4…

MALICIOUS

PDF

80.4 KB Created: 2021-05-04 07:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7ceef12bb14b370b66ad00f964bc74f SHA-1: 95b1bac60fcd4e8d85c6e3f7cc8e3aae48a78c63 SHA-256: dc9b7bc842c4c8d4870d2cac8caa7585e2449a961c3665e607fa2db189439417
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or redirection to potentially malicious sites. The presence of embedded URLs and the ClamAV detection 'Pdf.Phishing.Trojan' further support a malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its embedded links point towards a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=how+to+program+my+uniden+nascar+scanner
    • https://static.s123-cdn-static.com/uploads/4416656/normal_5ff4a3b3c8c24.pdf
    • http://simenomevaxi.iblogger.org/neo_darwinism_theory_of_evolution.pdf
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/jukapibowawelovi.pdf
    • https://fodigedij.weebly.com/uploads/1/3/2/7/132740281/8627719.pdf
    • https://kifenefaru.weebly.com/uploads/1/3/4/3/134327755/jusopeg_fiforofexukukoz_mememinotukov_wovesuvoxunu.pdf
    • https://static.s123-cdn-static.com/uploads/4486523/normal_5fffea43ce47d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dirujuwut.epizy.com/classical_cesarean_section_operative_report.pdf
    • http://lekaleramitogal.rf.gd/pubg_report_discord_bot.pdf
    • https://uploads.strikinglycdn.com/files/c5296393-b013-4c05-b82a-dc993b814ee9/how_to_write_proofs_in_real_analysis.pdf
    • https://uploads.strikinglycdn.com/files/6b656da8-5aaf-407e-afe3-8ceef8f1edd8/11820007764.pdf
    • https://uploads.strikinglycdn.com/files/48191ead-63e6-4346-8222-b12511f75fdf/minn_kota_terrova_70_i_pilot_reviews.pdf
    • https://uploads.strikinglycdn.com/files/db2d23d6-0259-48a7-b16b-dc68db5d957e/dutigifuverofov.pdf
    • https://uploads.strikinglycdn.com/files/3110c72a-f8c6-4308-bd16-8f9fa2e238e3/6372664426.pdf
    • https://uploads.strikinglycdn.com/files/20cd50fe-cfac-4aba-b769-cdfba1bc0724/30611093487.pdf
    • http://pobipegosaba.epizy.com/how_to_program_a_philips_srp5107_27_universal_remote.pdf
    • https://uploads.strikinglycdn.com/files/695263aa-752c-40d5-882a-89804cdc8d90/captain_underpants_names.pdf
    • http://wetosunonatag.epizy.com/stock_market_news_nz.pdf
    • http://konezisuvalexer.epizy.com/sugofinujaripuwolegibo.pdf
    • 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_off0000fd5b.bin
f464e370b363a7b1c08314b3077009bbe081e620d0862de82b6a3a4e03876ed6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 5516 bytes
font_01_sfnt_off0001101d.bin
34c83fefd824f495dbd3b1dedd3375efbfa25735ebb48df40c281e2acef20243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 10620 bytes

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