Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79c17448881d8ef…

MALICIOUS

PDF

104.6 KB Created: 2021-06-04 09:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86b63217f6c5583990008e98773c38b6 SHA-1: 7cbcc05e0d1894875134f4718f1f63a19a910e7f SHA-256: e79c17448881d8ef785630ebf534bbb882225407b565c4bbffb5b81d2f1baa75
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest an attempt to drive traffic to potentially compromised or malicious web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/pbw?utm_term=1000+most+common+verbs+forms+in+english
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/nazekusogepite.pdf
    • https://ripapexogona.weebly.com/uploads/1/3/0/8/130874469/2049142.pdf
    • https://gajokemijibefe.weebly.com/uploads/1/3/4/4/134467094/vakibisuwurafama.pdf
    • https://xixotileko.weebly.com/uploads/1/3/4/0/134018517/1651734.pdf
    • https://rezalebivug.weebly.com/uploads/1/3/0/9/130969918/vabibijobedigi_rilubezafa_mixigizovupuj_mafojuju.pdf
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/velaf_fusegajopatamu.pdf
    • https://sitasujo.weebly.com/uploads/1/3/4/8/134876827/xifonog.pdf
    • https://gabukoxikala.weebly.com/uploads/1/3/3/9/133997771/83cd8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jizakatum.pbworks.com/f/75094674728.pdf
    • http://vibevekofano.pbworks.com/w/file/fetch/144426585/shapes_worksheets_for_preschool.pdf
    • https://uploads.strikinglycdn.com/files/6f0f1775-a649-492b-ba1d-91f19a93101b/moleralajabowadaleti.pdf
    • http://vatojorisa.pbworks.com/w/file/fetch/144471462/77349311067.pdf
    • https://uploads.strikinglycdn.com/files/09a0e21c-f416-4ae5-8136-599a093f0a58/xanugevujidemoxigosuz.pdf
    • https://uploads.strikinglycdn.com/files/91f7bb33-4037-484f-8708-f5a67fec03b8/download_youtube_go_for_pc_without_bluestacks.pdf
    • http://gifavipa.pbworks.com/f/5195190905.pdf
    • http://siseraxoru.pbworks.com/f/swift_black_substratum_theme_free_download.pdf
    • http://kuperuxowix.pbworks.com/f/how_long_does_it_take_to_get_letters_of_administration_in_florida.pdf
    • https://uploads.strikinglycdn.com/files/5e5228d7-3e27-487e-9093-aefb6032f0c4/wapuxoledivomafasa.pdf
    • https://uploads.strikinglycdn.com/files/b7b3e8ec-60dd-498f-817a-9703836e3ea5/how_to_restore_ipod_nano_1st_generation.pdf
    • https://uploads.strikinglycdn.com/files/9aeda612-c74d-4c3c-9495-2a748b541d7a/how_do_i_connect_my_ilive_sound_bar.pdf
    • http://saladolu.pbworks.com/f/avast_antivirus_offline_setup_for_windows_xp.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_off00012e0f.bin
e336cc0603dfecaa417eca84e62ffdfd51d3b126544fd56da513e8925095fbc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 3896 bytes
font_01_sfnt_off00013bcf.bin
46a00858a77ca665d9f4b2a34b2a7ce8a6a475bd6f77d209f0815def09e33e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCF 5384 bytes
font_02_sfnt_off00014e04.bin
f4cfb6b787b51cf8831f34c10aac6e5614a4d630ca165504069d02872cdccece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E04 14404 bytes
font_03_sfnt_off00017d32.bin
4a631dd153fccf3d1791288cf60b496e9187c565bb2818684c0de191997b9366		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D32 16560 bytes

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