Malicious PDF — malware analysis report

Static analysis result for SHA-256 8593e7c82820a8e0…

MALICIOUS

PDF

76.1 KB Created: 2021-01-31 04:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76b6bd68d342c3e7fe68358c901baa2c SHA-1: 5bba9a2b3132016a5ce90185fd654d4241c411bd SHA-256: 8593e7c82820a8e03c33f78a3279a9b98fe76b804ee0b880c053cb5adf935540
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=ammi+ammi+ammi+mithithu+song++masstamilan In PDF document text
    • https://wofovadorobonam.weebly.com/uploads/1/3/0/7/130739883/740eb212e573.pdfIn PDF document text
    • http://netewe8.xyz/mitsubishi_forklift_fg25n_manualrdzr1.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/bjheZhj/blade_attacking_episode_1_eng_sub.pdfIn PDF document text
    • http://everydays.space/electronic_music_for_studying_mp3_download08ow7.pdfIn PDF document text
    • http://pravagims.net/dekepavubojoujx0t.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/4g6Zjhj/dome_of_doom_courage.pdfIn PDF document text
    • http://kukushka.space/neon_road_bikehfed2.pdfIn PDF document text
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/7120233.pdfIn PDF document text
    • https://relabibede.weebly.com/uploads/1/3/2/8/132816075/d8a6af1a158.pdfIn PDF document text
    • http://doworevo.22web.org/kindle_paperwhite_compatible_formats.pdfIn PDF document text
    • http://korsabarca.com/kali_linux_tools_on_ubuntue6fn1.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/1190777.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/hc2pick/iowa_farming_jobs.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/81554eae1f0f3ad.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevegure.rf.gd/88851055706.pdfIn PDF document text
    • http://zelejiv.epizy.com/gesego.pdfIn PDF document text
    • http://bezopiwuzalobit.rf.gd/amandeep_singh_songs.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e57e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE57E 8520 bytes
SHA-256: 59b4a4fa6f8552667939f3ce15c4a599f9766681655aa19b5d1c72f2eac6e171
font_00_sfnt_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 4992 bytes
SHA-256: 9131e838b7ff1cd838ba9e2c90726a7e01c9acf27ec0073d77c0d9a6802a364a
font_02_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10520 bytes
SHA-256: 27df63e67ddc914b6fd779b160a0da1870d650607487775dab11d3457f9f3d37

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