Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b48a48acbd9e05…

MALICIOUS

PDF

84.8 KB Created: 2021-02-21 12:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4cf3871ea9031d8179548b08ae96fd9c SHA-1: fd3515037445dc4108cf8dbf9671b2764d9cf902 SHA-256: 43b48a48acbd9e054c90383717b317df24b0af8f56d48043ca0e342ab4ef0955
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to 'resetting a DSC alarm', which is likely a lure to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=how+to+reset+dsc+alarm PDF link annotation
    • https://cdn.sqhk.co/jutigurotow/agibChg/80606576511.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/hjdzhjm/carx_drift_racing_online_ps4_update_1._04.pdfIn PDF document text
    • http://subumobo.22web.org/niganigodakuwudikaz.pdfIn PDF document text
    • http://sewonmedix.ru/672033113201j54i.pdfIn PDF document text
    • http://nimened.66ghz.com/9098762736.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/iigipHJ/lizun.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/gegj5Qt/snakes_and_ladders_board_game_print_out.pdfIn PDF document text
    • http://natur-bio.space/xuzezemikirakezowemenekij7hz.pdfIn PDF document text
    • http://tigatixe.iblogger.org/pixapobufumaz.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/jdWhboL/3109_blazing_star_trail.pdfIn PDF document text
    • http://bumaga.bz/gw2_crafting_guide_armorsmith47i4t.pdfIn PDF document text
    • https://cdn.sqhk.co/kojogitu/ihjah0k/software_update_iphone_5se.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/gRLtijp/mirinebaludo.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/gehcgd2/mi_launcher_app_apk_download.pdfIn PDF document text
    • http://nowefewafugaki.iblogger.org/platform_9_3_4_store.pdfIn PDF document text
    • http://voxamuzovo.22web.org/banolumujikamanumu.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/nBhbhgg/escape_room_the_apartment_game_level_2.pdfIn PDF document text
    • http://smeh-mif.space/30150660840o90gk.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/y5iz8ja/jetinifovadere.pdfIn PDF document text
    • http://pobigajik.22web.org/not_attending_interview_mail_format.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokanagupak.rf.gd/24656628048.pdfIn PDF document text
    • http://zovopabipani.rf.gd/moana_cartoon_movie_song.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f900.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF900 14160 bytes
SHA-256: ce41a212e8c4d92ddf8734d6a7eb3e04e88f28eb1e6a47bc33652d86cbe5f56d
font_00_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 5140 bytes
SHA-256: d9800a58db606d3c6c6d48e2ed033b17e63ebc4ca78009b1b20874bcfe918195
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 10856 bytes
SHA-256: 45d1b297133c89b188bb92e12687abe9dd78c3b6d76526f5f7c5a03b11572489

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