Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b996519eac17ac…

MALICIOUS

PDF

87.6 KB Created: 2021-03-14 06:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 97804d207128565e72813a0c16f2fa62 SHA-1: bc34e5b328f10f72e38422cf2ed26fa43f6bf5cf SHA-256: 65b996519eac17ac05e71e062a033b6b6eef660254bf1acb4b1f6051507ce77e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, with several pointing to potentially disposable domains, suggesting a link farm or SEO spamming operation. The presence of a URL with a 'utm_term' parameter further supports the idea of traffic redirection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://maypoin.ru/strik?utm_term=what+fuel+does+a+coleman+stove+use PDF link annotation
    • http://detonic-romania.website/80648211000b3bfz.pdfIn PDF document text
    • http://wirufebo.22web.org/13099741077.pdfIn PDF document text
    • http://zeropium.com/what_is_the_story_of_cain_and_abel_really_aboutn0oh0.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/nuwipakivek113e.pdfIn PDF document text
    • http://bimupodum.iblogger.org/cello_32_inch_android_tv_review.pdfIn PDF document text
    • http://wirelessinfo.ru/epsxe_bios_plugins_pack3xjx0.pdfIn PDF document text
    • http://negozio50sconto.info/mufujajg5bs6.pdfIn PDF document text
    • http://inscarusa.info/76819052552zjtwr.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/choir_sheet_musiczng37.pdfIn PDF document text
    • http://furniture21.online/jumping_spider_pet_tricksbawyf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/209be81a-2906-4eba-9b66-34af64c81c82/is_2020_a_good_year_for_horse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df692a21-b68a-4379-9d8a-73efb74ffbb2/vocabulary_from_latin_and_greek_roots_level_xi.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_763e5e5cd50443228c697001bc1269a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73bae9c8-bce1-4a86-b7e6-ccc7a63b7969/what_causes_dry_itchy_patches_on_scalp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f3ee98-8909-41c2-9e90-ca6c5ac9f6f8/the_universe_next_door_chapter_5_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37fcae2-f3b9-49e2-ad28-ad45aad6cf99/looking_at_philosophy_the_unbearable_heaviness_of_philosophy_made_lighter_fourth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e87259-9e82-40a1-a776-ad914dc1b784/brighthouse_remote_control_ur5u-8780l-bht.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5e4588-7dd8-4a34-b4aa-ea61f72c5258/nipemuxuvenuwavifav.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_1c09c6c1786844d19d28a286a88e3b3b.pdf?index=trueIn PDF document text
    • http://romipozaxijida.rf.gd/35572292680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc8482a-5a6f-4547-bab2-57e8969b526f/26352783984.pdfIn PDF document text
    • https://e191375a-959e-431f-84a9-a18a669eb879.filesusr.com/ugd/3283b0_69f1f7ccd614453699b1141a7548c555.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_e1d57cf646444b3bb1bfe92c5f6fa2ff.pdf?index=trueIn 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
    • 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_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 5072 bytes
SHA-256: 3705037cb242d57f5f4143b61a9ccc83d166560927218f39cf4ba6037858af5e
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 11240 bytes
SHA-256: a01a02fd5b350f9be223557e649803516eaa33260601a801f197baaad291e12b
font_02_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 16184 bytes
SHA-256: 59bd9faf73b945fa4dd601516dbb9186deacf479735410a520c5b6c7f94add4f
font_03_sfnt_off00014266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14266 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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