Malicious PDF — malware analysis report

Static analysis result for SHA-256 620dea4f9a882878…

MALICIOUS

PDF

81.8 KB Created: 2021-04-07 09:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 26a232ef1babb708d2a5cbe8e35b7412 SHA-1: 530e75214c97204dfc7da0258315231bf04826af SHA-256: 620dea4f9a882878aa2e396cf00baa87a8dcd3e8985b9eca32cd25e691d780e7
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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/award?keyword=caffeine+effect+on+heart+rate+and+blood+pressure+pdf PDF link annotation
    • http://barajofa.mywebcommunity.org/under_the_dome_season_3_episode_4.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/lNHChj7/37364782737.pdfIn PDF document text
    • http://fetoxuk.mywebcommunity.org/gonefofebutitetumagok.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/ap_calculus_bc_cheat_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/idhajdA/slice_the_pie_review_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/cSiawhj/samsung_blu_ray_player_audio_out_of_sync.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/Ja14fij/52614638385.pdfIn PDF document text
    • http://vibijinit.scienceontheweb.net/architecture_residential_drafting_and_design_11th_edition.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/67369566093.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/77XLU38/jaropamesarawetakopijefux.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/s6ig6jp/84505947682.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/jjBifW1/damewaborosowegiziluw.pdfIn PDF document text
    • https://cdn.sqhk.co/rijujonakuje/akjbDhf/princess_run_3d_game_download.pdfIn PDF document text
    • http://xikimubixod.22web.org/79813832547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_a7f2fbda3d0041a5abd72b4ae226eacd.pdf?index=trueIn PDF document text
    • http://mevuxuru.atwebpages.com/juxogapuwizoperasufeze.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_a43e56dfc1f54c0d82e97072ad0de778.pdf?index=trueIn PDF document text
    • http://tikeresepujel.onlinewebshop.net/78521767661.pdfIn PDF document text
    • http://zenejifawulo.epizy.com/bsgw_kwijtschelding_formulier.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_fbd9c31142fd4ec78ee25f63a4d82987.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_6c48a728a4f6487aa667c4d4d43527eb.pdf?index=trueIn PDF document text
    • http://benifolagalat.epizy.com/biotic_and_abiotic_environment.pdfIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_75cfb9d5226b418a81198a5a514b9972.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 5288 bytes
SHA-256: c1c04a7ff40f6c40e71c3d9132e6fdd48e5d3473c3cb8d4e50c3bed98789081c
font_01_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 10860 bytes
SHA-256: 3829c8be04ac88ef4a84944c8cbd9284ea70cdba720b7a4504efb192baa69779