Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1f0ba8b5b3a881…

MALICIOUS

PDF

80.9 KB Created: 2021-03-31 20:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab6f6db2fa7bc8d7fb3d3f429d8e7310 SHA-1: 76ec49619425ccc632f0d2c1faa5836e8c06df41 SHA-256: 7d1f0ba8b5b3a881aa70d07367ad8df84f33c9b1e38a33e3f712f345f4d644c0
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning attempt. One of the primary URLs, 'https://xezojetit.ru/award?keyword=advanced+computer+architecture+kai+hwang+naresh+jotwani+pdf', appears to be a lure for technical documentation. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and a critical heuristic identified a mass of external PDF links, indicating a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=advanced+computer+architecture+kai+hwang+naresh+jotwani+pdf
    • https://cdn.sqhk.co/lojosexotak/gghLiiI/fiji_airways_fleet_details.pdf
    • https://cdn.sqhk.co/kewudomavave/RVhglEu/highway_to_hell_guitar_tab_easy.pdf
    • https://cdn.sqhk.co/zimuteraf/cgsiaMh/pisabotiramenefufilose.pdf
    • https://cdn.sqhk.co/fuwasokeg/FihqKut/lezazexowomos.pdf
    • https://cdn.sqhk.co/viwedanej/VsZii6G/21295503794.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/godoremitiwuja/xenubujilopijedanedisaj.pdf
    • https://s3.amazonaws.com/jokotaziweluge/vexeren.pdf
    • https://s3.amazonaws.com/wakuzidi/lenovo_t430s_bluetooth_driver_windows_10.pdf
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_a8ffb10ca591462aa4fc88eb82a94911.pdf?index=true
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_5a1e10775d8c4485b15d63c87474cd1f.pdf?index=true
    • https://s3.amazonaws.com/werowibovezoje/atm_ki_full_form_kya_hoti_hai.pdf
    • https://s3.amazonaws.com/ladojenefe/antivirus_free_for_windows_8_avast.pdf
    • https://s3.amazonaws.com/fedufiporara/piano_music_comptine_dun_autre_ete.pdf
    • https://s3.amazonaws.com/padosumifubobo/73674566007.pdf
    • https://s3.amazonaws.com/remuv/how_to_connect_polk_audio_speakers_to_receiver.pdf
    • https://s3.amazonaws.com/toguvaju/nutrition_information_milky_way_mini.pdf
    • https://s3.amazonaws.com/lemefofutomapox/molecular_mechanism_of_cell_differentiation.pdf
    • https://s3.amazonaws.com/metakibeme/46279579517.pdf
    • https://s3.amazonaws.com/fopalew/37715144667.pdf
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_7532a89cd1004f5aa45bca379fcdee82.pdf?index=true
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_45174c573ea9400c8845642e617aa346.pdf?index=true
    • https://s3.amazonaws.com/supefujoxopubu/homelite_3100_psi_pressure_washer_pump_parts.pdf
    • https://s3.amazonaws.com/xojafemori/vemoru.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_off0000f56f.bin
7c624ba4f9c04acfa904152d304ea984785e8464822dfcfc8b56c557aa0f5dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 5820 bytes
font_01_sfnt_off0001092c.bin
6eef41cad583c6d136f1247944b9f3d4a2c91cf673be427f60724ad02966ba58
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 12488 bytes