Malicious PDF — malware analysis report

Static analysis result for SHA-256 da57c0afb5b0c0cd…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 07:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ffba6f65b0c6fec62de23895f24cf99 SHA-1: 964b3a63847d7548d1829db6467408364a6b79b9 SHA-256: da57c0afb5b0c0cdcd9d7a5be747820b549ccd41855a1fb86b0bb0875beb669d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on external domains. One of the primary external links is to 'https://resalured.ru/strik?utm_term=how+to+become+a+cheerleader', suggesting a lure to a potentially malicious or SEO-abused site. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://resalured.ru/strik?utm_term=how+to+become+a+cheerleader
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/resefat-nusifenil.pdf
    • https://cdn.sqhk.co/jorisuzil/ij1FieF/underwater_racing_car_stunts_maniac.pdf
    • https://wavafebezed.weebly.com/uploads/1/3/4/5/134527209/3185b9c.pdf
    • https://cdn.sqhk.co/feledigowud/idhf85V/dunogefil.pdf
    • https://cdn.sqhk.co/vipujitebiki/ujeVjbl/degudofitojoxosolob.pdf
    • https://cdn.sqhk.co/wuvitatutuv/hgFhigB/spartans_vs_zombies_defense_mod_apk_download.pdf
    • https://cdn.sqhk.co/fogibadeku/XkR67jj/8223424595.pdf
    • https://cdn.sqhk.co/ziveluki/ilxgiip/mobakiwebajoxojavuwemuru.pdf
    • https://cdn.sqhk.co/jisaside/7r9if5l/write_the_solar_system_name.pdf
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/vugosamijelan-muximobewel-lulivukez.pdf
    • http://mapitunokon.22web.org/85072157280.pdf
    • https://vozapevozatoka.weebly.com/uploads/1/3/4/0/134097066/ca6d76f891.pdf
    • https://cdn.sqhk.co/febowozefu/gdghMij/yellow_wallpaper_4k_hd.pdf
    • https://cdn.sqhk.co/furafurume/gNgf4jf/vojak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wujasulo.epizy.com/29330467489.pdf
    • https://uploads.strikinglycdn.com/files/840634aa-c631-4c3f-b97e-71fd35f6dea2/dante_paradiso_canto_33_summary.pdf
    • https://uploads.strikinglycdn.com/files/11afdec8-449c-4a69-8b24-729039d36670/essential_university_physics_volume_1_3rd_edition_free.pdf
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_9e761d6742994b5caf51f1f25238269b.pdf?index=true
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_0469b879cd9a45589b534e60b28f8097.pdf?index=true
    • http://fulawumobolofog.epizy.com/apowersoft_video_capture_6._4._8_crack.pdf
    • http://modujufuwalali.rf.gd/get_android_billing_key.pdf
    • http://roxugotosaka.epizy.com/crazy_little_thing_called_love_queen_chords.pdf
    • https://uploads.strikinglycdn.com/files/41ce9593-cb1a-43b5-88d1-4cf2c9723314/54651861953.pdf
    • https://uploads.strikinglycdn.com/files/087a7bd5-2617-472e-b244-df6c39fcfb11/tagopenududavuxerugala.pdf
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_f20fc28b8ffe410699117e6df08eae75.pdf?index=true
    • https://uploads.strikinglycdn.com/files/57660831-749a-43de-8159-e35401083835/how_long_to_learn_cad_design.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f010.bin
02748703d1fa73106f3a4e22b90688f2d6555e7c92f811ca1327565466456dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 5192 bytes
font_01_sfnt_off00010191.bin
51c9c1bbd2590b4ce74cc9933f2e331daa9d770f2e1f3b7f7134c4a6797a8b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 11044 bytes

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