Malicious PDF — malware analysis report

Static analysis result for SHA-256 593990a27be9b6f9…

MALICIOUS

PDF

71.5 KB Created: 2021-04-30 06:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44f9cf9b866b65394abe66ab2ff8ff90 SHA-1: d6e885ddfc3bdbbb4a87a0cdad3f816ca9008bbe SHA-256: 593990a27be9b6f96fb23c6094b94d98b4bd0219648e27bd0426a36666c0becf
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily corrupted, contains keywords related to 'vegan food for weight loss' and the wkhtmltopdf generator, indicating it was likely used to create a PDF designed to drive traffic to malicious or spam sites. No scripts were extracted, but the presence of numerous external URLs points to a content-driven lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=vegan+food+for+weight+loss
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdf
    • http://pojapusevipuzu.mypressonline.com/creative_writing_prompts_for_adults.pdf
    • http://xawamiwupajev.mygamesonline.org/auditor_fiscal_do_trabalho_edital.pdf
    • http://bewizasosu.sportsontheweb.net/51119351690.pdf
    • https://cdn.sqhk.co/felolavap/heich1k/6088159580.pdf
    • https://cdn.sqhk.co/ruselaguzoda/UUaheLS/70899324960.pdf
    • https://cdn.sqhk.co/fupokiwil/hf9lheC/pac-_man_and_the_ghostly_adventures_gameplay.pdf
    • http://kigirifaduguv.getenjoyment.net/bipelozekar.pdf
    • https://cdn.sqhk.co/pananumujo/94btgep/zuvikane.pdf
    • https://cdn.sqhk.co/numiwufeguv/bahjic7/livudutigage.pdf
    • https://cdn.sqhk.co/xedufoga/fsNsjhf/63230801150.pdf
    • http://goxopisejeza.22web.org/cargador_duracell_is1000.pdf
    • http://rodisawikikofu.medianewsonline.com/medical_internet_of_things_and_big_data_in_healthcare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bosadubarelazu.rf.gd/primitive_bubble_shooter_game.pdf
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_88f12bab84f04b82b03c18721574827c.pdf?index=true
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_f4db24b5b1b0460ab6f333171a010b59.pdf?index=true
    • http://bofepojiwo.rf.gd/panasonic_katalog_2020.pdf
    • http://penisidisipifo.rf.gd/sennheiser_ew_100_g4-835-s_wireless_handheld_microphone_system.pdf
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_778a2ea0652b4249ba087920cfda0125.pdf?index=true
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_beb9265e762d45a18739864a587f2e70.pdf?index=true
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_2f67fecc296647d59cd7137266d9cd21.pdf?index=true
    • http://pozulunifo.rf.gd/what_is_the_universal_remote_code_for_toshiba_tv.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_off0000dce8.bin
e75b8e6768f07e642aabb05743ec3d7363ad89e6b2f22ebdaee0f6e68f20b0a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 5224 bytes
font_01_sfnt_off0000eec5.bin
3ffccdbf61dcd6b1272a0423a7cc7e7bfe94bbc44fc322c300152f6d66f8943f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 9836 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.