Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50bd1596b0b70a4…

MALICIOUS

PDF

140.0 KB Created: 2021-01-14 02:45:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e4c6deaabfa22941307818ec2b71fad SHA-1: 372f07d110cdaf83047ccf58f48c79f5d76a6d8b SHA-256: d50bd1596b0b70a4081e557e87cc85fb88e816d8df4f114cca451a329f4aed47
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured with UTM parameters, suggests a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its construction. The primary attack pattern involves luring users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9735

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://traffset.ru/aws?utm_term=obtener+curp+con+nuevo+formato PDF link annotation
    • https://site-1191329.mozfiles.com/files/1191329/zumba_classic_bubble_shooter_puzzle_games.pdfIn PDF document text
    • https://site-1172092.mozfiles.com/files/1172092/cobb_theater_merritt_island_movies.pdfIn PDF document text
    • https://site-1177275.mozfiles.com/files/1177275/50398907651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fc2d951bfbb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5fa2efa62dba5.pdfIn PDF document text
    • https://site-1171564.mozfiles.com/files/1171564/50719015928.pdfIn PDF document text
    • https://site-1205734.mozfiles.com/files/1205734/free_robocall_blocker_iphone.pdfIn PDF document text
    • https://site-1168272.mozfiles.com/files/1168272/3252533623.pdfIn PDF document text
    • https://cdn.sqhk.co/faxenukev/ShPvmCW/best_soul_armor_minecraft_dungeons.pdfIn PDF document text
    • https://site-1177705.mozfiles.com/files/1177705/driver_keyboard_acer_aspire_one_d270.pdfIn PDF document text
    • https://site-1172267.mozfiles.com/files/1172267/rope_rolling_forearm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/jukebox_song_list_template.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F05 6956 bytes
SHA-256: e9e727db18537fab833f9d35bef26ee19355a18aa0ab2f60ff1774c5a72d2b89
font_01_sfnt_off0001a028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A028 5012 bytes
SHA-256: b935280920c9307a15ca8a3977db03bb53c0bcb140e678f56f4197416d44f9bc
font_02_sfnt_off0001b10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B10E 10936 bytes
SHA-256: 627397957001f0f96be5255fe0c13a4cfafc6f932c03ef723f733025dde8142c
font_03_sfnt_off0001cfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFDB 12476 bytes
SHA-256: cecad8ce10a53889440de5097403884729486e51e4096b65dab5acc47e8fdfc0
font_04_sfnt_off0001f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8D7 17200 bytes
SHA-256: f4b5282c580c173fbdda2ebbe53839c6108ec4084663dbb78c744eecdc71576f
font_05_sfnt_off0002115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2115B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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