Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5a7bebb1fd5c0a…

MALICIOUS

PDF

89.2 KB Created: 2021-03-16 00:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf4b0396a85c7f087b4e138256fff53f SHA-1: d30acacaa2632b22594fbb869b2403acc8edece0 SHA-256: 9a5a7bebb1fd5c0ae0b7f56facdcc1061105c49f64fc30fb39eac9ae9d8e9548
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as a link farm, suggesting a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=wife+of+bath+quiz+answers
    • http://rumepado.mypressonline.com/89619655989.pdf
    • http://groshyk.site/dell_latitude_d830_hdd_upgradeax95u.pdf
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/f08ab.pdf
    • http://service-hire.com/wakozojunodozajexutubepop790du.pdf
    • http://bawimip.sportsontheweb.net/87212226454.pdf
    • http://jofipifemu.medianewsonline.com/1646118522.pdf
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/cd4a7a36374160.pdf
    • http://sosed.market/clasificacion_de_la_materia_y_su_relacion_con_la_energian8a5t.pdf
    • http://aarbuz.space/95985615644x1wob.pdf
    • http://koponegigat.medianewsonline.com/killing_floor_2_wiki_medic.pdf
    • http://thrivewebs.com/digital_photography_classesk77n0.pdf
    • http://ramuwesitavoz.mywebcommunity.org/ergo_omni_360_cool_air_mesh_newborn.pdf
    • http://vaxiliwu.medianewsonline.com/addictive_drums_2_custom_xl.pdf
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/691965.pdf
    • http://fusekimutoxi.sportsontheweb.net/april_may_june_2020_calendar.pdf
    • http://vifezitenof.getenjoyment.net/57139717343.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/82ed2dd8-7dee-491c-9012-93674330f4aa/chattanooga_hydrocollator_manual.pdf
    • https://uploads.strikinglycdn.com/files/6a7d1a72-ac2c-49e3-ac81-84f9ed5ca89a/can_i_sue_for_emotional_distress_in_california.pdf
    • https://uploads.strikinglycdn.com/files/4423ce24-cdb7-486c-8289-441bdc2f75e1/how_to_save_google_maps_online.pdf
    • https://uploads.strikinglycdn.com/files/40e4da71-b844-4d5a-9e16-24126654969d/sikezofiniwodij.pdf
    • https://uploads.strikinglycdn.com/files/12608201-2c11-4319-9e83-9998c1d85882/nubisoker.pdf
    • https://uploads.strikinglycdn.com/files/f828a4fd-5151-47b4-997c-5270d09cae21/glacier_bay_shower_faucet_handle_replacement.pdf
    • https://uploads.strikinglycdn.com/files/e39e9cd6-50ab-4d36-a592-15ba20b5c7e7/gibezagezikujopagidudi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab4.bin
132538d56b0942d6b7b14d2c4fb46f23a88d954e6f86ca39eb4d0bb797363ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 3332 bytes
font_01_sfnt_off0001069b.bin
edd53de15b40fec127b958b482143942ebc534c4ab3069f01ea9ff088e4dae84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 5244 bytes
font_02_sfnt_off00011890.bin
2c55dc688bfafb22527d0c99fb61d74d7102921e37dd2289001e8fb4d689b64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 12072 bytes
font_03_sfnt_off0001409c.bin
952de7a5f6edfce1f629d1fc2a7a5c8a5df8ee5b1fd054e5690fca673cd3b4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 16324 bytes

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