Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7098c96af847380…

MALICIOUS

PDF

79.8 KB Created: 2021-03-28 01:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4d0cb5b1596b69f402bdb12f947daf66 SHA-1: fa66ac3df9a45ff97df98e90960e49b51217a0b2 SHA-256: d7098c96af84738051a47b8065cbc50ee2db90ab3076e0421248658c509074ce
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL observed is https://golowaki.ru/strik?utm_term=contabilidad+de+costos+que+estudia, which is likely part of the malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=contabilidad+de+costos+que+estudia PDF link annotation
    • https://cdn.sqhk.co/dojidavos/hjAtvgj/79957618750.pdfIn PDF document text
    • https://cdn.sqhk.co/mubogasaven/5gfdhcG/pupajejozap.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/sQijdmt/zupibox.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/jaRjiDZ/fire_emblem_heroes_jet_black_march_guide.pdfIn PDF document text
    • http://vobefoli.iblogger.org/samsung_grand_prime_price_in_bd_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/FEjbjhe/bofoboremawifabirudubiv.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/pgjCigQ/traffic_car_run_2d_special_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/bW8mLDN/espn_nba_standings_2017-_18.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/will_chamberlain_wireless_keypad_work_with_genie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bcf19d45-0f15-45c2-a6c7-5b4dbca1d2a0.filesusr.com/ugd/a298ce_8c5a2e80559647489f9d032fea923954.pdf?index=trueIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_8e34aa64cd79421484cba5d56cc2adef.pdf?index=trueIn PDF document text
    • http://tivakifuzir.atwebpages.com/686021394.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/best_text_to_speech_software_free.pdfIn PDF document text
    • http://pitigapevede.onlinewebshop.net/cuanto_m2_tiene_un_metro_cuadrado.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_fa11610664cf4dd292e0b00af29be94c.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_507bb80e73ba4738a88475bb3b83c1b2.pdf?index=trueIn PDF document text
    • http://ginokiximoz.rf.gd/61294202770.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/xodobowu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 5008 bytes
SHA-256: 3facd8c8ce161449f5afcbed5865bcd5ff8a13687439571a2f6728c6590b044e
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 12008 bytes
SHA-256: 4d3fc6e5203ca0aa9ea787b63c10af9f6259b8f2775696b4f348dcd223253d40

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