Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7303735008b13b…

MALICIOUS

PDF

66.8 KB Created: 2021-03-10 15:33:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c084a6386e050b41d0d5da0073b28b6e SHA-1: 9ac092cbc5837609000ac7ce4a2940998d4406c2 SHA-256: fd7303735008b13ba7ff27abb05b3be1156b0038b4063f467e438d73d93bdae2
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. The embedded URLs suggest a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=bodyweight+workout+routine+at+home PDF link annotation
    • http://getveran.site/51373784667fussz.pdfIn PDF document text
    • https://sawonelezaxiso.weebly.com/uploads/1/3/4/5/134588179/fizetifananadadem.pdfIn PDF document text
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/1187412.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/beautiful_liar_zara_cox_espaol.pdfIn PDF document text
    • https://tisitijalazog.weebly.com/uploads/1/3/6/0/136017937/05450477.pdfIn PDF document text
    • http://localdesign.me/63174130058y3ngw.pdfIn PDF document text
    • http://megalit-korolev.ru/juxeburm7b0.pdfIn PDF document text
    • https://pudefita.weebly.com/uploads/1/3/4/4/134476078/894618.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pedamodaw.onlinewebshop.net/warubuzagirivularagadana.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_6866c8ebbb424c9aad7f8799ab38dc4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7befd3d2-8e47-45bb-960d-d84da5758b1d/how_to_find_disposable_income_from_gdp.pdfIn PDF document text
    • http://jokosen.atwebpages.com/what_is_the_best_water_cooler_dispenser_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe3e790-3558-47d4-8a24-447a420311fb/who_are_the_4_main_characters_in_the_tempest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbde97ea-0a0c-4ab5-bc8d-1df56d5209af/liwugivewusiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e598bb42-7e95-4fbc-864e-de60805427b6/towurawetikudapi.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_c04a133f371941ccadb5f7c256f13f22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/boogie_down_productions_criminal_minded_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/abyssal_demon_range_guide_osrs.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_7bb4ed9f59464e5fa239307871d91ebb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/54853686168.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_23020e97747b450ea15b2c27342b17a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48cd79b5-f11e-456b-bdf5-74f9465c2999/42352876467.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83E 5336 bytes
SHA-256: b74e343b7f6cf055a254d0a4cc4346fc9cb19902792378edc9495a8622e0dc9d
font_01_sfnt_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 10456 bytes
SHA-256: 508262b6751ccc5f15c3c0011caee2a32f5d201ea3bee3fc6e01949316f9c2d0