Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e04bc0cfe150280…

MALICIOUS

PDF

73.8 KB Created: 2021-02-26 12:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: dd87fab664c15ee497018b14273c249d SHA-1: 10d95a7d0e2b0fe92f550e2f8d55e7219e62b9c1 SHA-256: 8e04bc0cfe150280e77863f7cb4ef544f42c83d11a6753158ed416b6dbb07a1f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, with many hosted on disposable domains, indicating a link farm likely used for phishing or malware distribution. The document body, though truncated, contains text related to covalent bonds, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+are+simple+covalent+bonds+structured PDF link annotation
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/c331ee.pdfIn PDF document text
    • https://digavonuvuveg.weebly.com/uploads/1/3/4/8/134851043/xivefesonabe.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/juzajumifevevovu.pdfIn PDF document text
    • http://tapadobav.iblogger.org/43538717641.pdfIn PDF document text
    • https://kepinofex.weebly.com/uploads/1/3/4/0/134017679/givodoredoko_fukof_panakiligekaj_powenodinafele.pdfIn PDF document text
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/luxawap.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/how_to_replace_a_whirlpool_dryer_idler_pulley.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/before_i_fall_book_vs_movie.pdfIn PDF document text
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/vorukusiwaveviguxaro.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/how_to_install_adobe_flash_player_in_chrome_android.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/fokejakevubij.pdfIn PDF document text
    • https://juvifopabolosat.weebly.com/uploads/1/3/5/3/135313118/dosuwakomaw_davaminexumu_jisegonaninujov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwuxatedi.epizy.com/57757179966.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/49324102799.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/jodalosu.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_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 5472 bytes
SHA-256: a2df2f82e1dae2d3ffa48afa9bb2a4e43f7f746ae6ea887d3cf9818ec8172241
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 10528 bytes
SHA-256: 344ef601ef3fbfb1ef37f6dd2a4f5e6716635fa8454082b26c4179cf9640cbfb

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