Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b56836ba52e350…

MALICIOUS

PDF

117.3 KB Created: 2021-03-22 16:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b7b8faaea6dab011efb404edae59ae3 SHA-1: dacdd3fe73e81bfe4e083c971ad6c67f1d774b3e SHA-256: e3b56836ba52e350b8cef8541aefdc331026563e0a1374930f11eb0e5bda947a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=biological+soil+and+water+conservation+pdf
    • https://gekanabedo.weebly.com/uploads/1/3/4/3/134318260/555741.pdf
    • http://tozidak.mygamesonline.org/celebrity_equinox_deck_plan.pdf
    • http://osummer.space/braun_thermoscan_7_ear_thermometer_irt6520x5ezl.pdf
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/nosabolov.pdf
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/45e6b1a42.pdf
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/748d264.pdf
    • http://torixobo.mypressonline.com/cazadores_de_microbios_resumen_por_capitulos.pdf
    • http://stalekost.site/77051478111y7gso.pdf
    • http://trysoda.club/why_is_my_yeti_microphone_not_workingp3moe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_63b73c00ffa54b53a78eda11c922fa5d.pdf?index=true
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_dc9fe9b88d7b4ac1ba1673b357fa9010.pdf?index=true
    • https://s3.amazonaws.com/gisujubolidine/65288234195.pdf
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_dffe582f26da4d1dac7de3618219467d.pdf?index=true
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_ebd0d1c3af1a424c9948f7bec3b2d03c.pdf?index=true
    • https://s3.amazonaws.com/jigezilor/how_much_in_nepali_language.pdf
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_359efe213e4a4ac08ec13777d402d08e.pdf?index=true
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_924e81dd1e924a0ba6498d35beee0b34.pdf?index=true
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_748fe27fa0664230b8ad807bb8752c19.pdf?index=true
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_2983d000070e4ef694adaf455a51aaa7.pdf?index=true
    • https://s3.amazonaws.com/wujodibu/abhimaan_movie_song_bengali.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017ff7.bin
9fd79284005e67c9662e7d3ed305f92f4396802d5184df0b6ea9726fc86c98b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FF7 5312 bytes
font_01_sfnt_off00019222.bin
7773d61d6d47384683151f76fd019086b671fa7896cdc72ec8b6e516dba8b0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19222 11540 bytes
font_02_sfnt_off0001b8e6.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8E6 4324 bytes

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