Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d217aa8e0b0d3e1…

MALICIOUS

PDF

75.7 KB Created: 2021-05-07 19:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 942a1c7f1a0218e06e230c2f0bc729fa SHA-1: d261eebda3ed2239c5807cc48912b8a5e9c7d931 SHA-256: 4d217aa8e0b0d3e1fc7f7e2f5c2d2bd5def43d34321f8a6c49bd81f57660dd9a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests it could be used to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=how+to+pair+motorola+verve+buds+110 PDF link annotation
    • http://lupuneruw.iblogger.org/cyborg_full_movie_free.pdfIn PDF document text
    • https://gujibukogise.weebly.com/uploads/1/3/1/3/131380045/d31ffe98857752.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/bosch_brute_jackhammer_troubleshooting.pdfIn PDF document text
    • http://lovupijuti.getenjoyment.net/vavabivujatoluratosibi.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/bofud.pdfIn PDF document text
    • https://sikapekit.weebly.com/uploads/1/3/5/3/135317012/0ae1cfaad.pdfIn PDF document text
    • https://debivozujorebol.weebly.com/uploads/1/3/0/8/130813616/xodefevitopajafadoj.pdfIn PDF document text
    • https://felomogolupa.weebly.com/uploads/1/3/4/3/134345494/xuzibob_zivoz_larotezewulufol_panuvezede.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/booting_in_computer.pdfIn PDF document text
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/7829082376a6.pdfIn PDF document text
    • http://kamodokawi.iblogger.org/67801739826.pdfIn PDF document text
    • https://dikejupovavobu.weebly.com/uploads/1/3/1/0/131069859/a28a853.pdfIn PDF document text
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/8795056.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/sexogetirope.pdfIn PDF document text
    • http://kowezuzapine.66ghz.com/advantech_acp-_4320_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dalumawinalejat.epizy.com/sociology_notes_for_upsc.pdfIn PDF document text
    • http://fotebujos.epizy.com/alphabet_coloring_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6391ceb9-c4d1-4ddc-838b-5d8202154a5e/how_to_change_yunmai_scale_from_kg_to_lbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/600b0cc2-817c-4e26-a847-8a431dea687c/how_to_program_my_ge_universal_remote_to_my_dynex_tv.pdfIn PDF document text
    • https://1a73feee-b327-4bc5-ac54-9d367b44a425.filesusr.com/ugd/226baa_f4d6ba9e1b5e48e1ba26705ab8ebf523.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4792f0e7-3666-4045-a296-553e81619636/sports_illustrated_swimsuit_2017_models_photos.pdfIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_4179f7a038834b1bb0b8a2bf7098009c.pdf?index=trueIn PDF document text
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_825c98e1371c47ada7c30d2d0f783e96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e163f06-5884-4044-9906-68c2c6c1106f/gamidopi.pdfIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_791d0925b3d6478e90e695750f3c3e76.pdf?index=trueIn PDF document text
    • http://lurolubudoruk.onlinewebshop.net/12097769648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc24be81-1e1e-4c91-9591-5d7a905d5bc5/kamitiridirupogupopasobal.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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 5552 bytes
SHA-256: fefa60bf96bbdebf69c71b73a0a10345b9babce0ce9883b4eee1baee673562cc
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 14744 bytes
SHA-256: b586ed68493f5730b332075667e3574bede70b9594fc3e7277d9d0f47d3ccc67