Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d8d238d533d6fb…

MALICIOUS

PDF

67.8 KB Created: 2021-02-24 14:38:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8d66fc5d08d2713ddde5972b370fe92d SHA-1: 49df0d49993390523210a177ffd87cee933a5d2b SHA-256: 98d8d238d533d6fb45c0775850d9b87f5d542970d93be9ae8eb2025394836b05
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'parts of a sunflower and their functions'. The presence of multiple disposable domains and link farms points towards a campaign designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=parts+of+a+sunflower+and+their+functions PDF link annotation
    • https://cdn.sqhk.co/votezevon/bzrpUja/hot_videos_netflix_2020_new.pdfIn PDF document text
    • http://poradoit2.site/ata_100_chapters_complete_listtsnmg.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/NggHfj4/mijisejobumunaluvubivam.pdfIn PDF document text
    • http://formblckr1.xyz/pathogenic_contamination_controlem8cx.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/hbCQfgj/sawewiwijetuvixav.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/0Ufibig/weather_real_time_map.pdfIn PDF document text
    • http://com-servers.online/846399184861uik6.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/AaMFih0/piano_melody_letter_notes_faded.pdfIn PDF document text
    • http://com-signto5.xyz/hy_gain_av_640_vertical_antennarkbuc.pdfIn PDF document text
    • https://cdn.sqhk.co/vofemolat/uGibv6Z/biwalefutetedi.pdfIn PDF document text
    • https://cdn.sqhk.co/metevetufi/ibJiahc/land_rover_discovery_5_off_road_accessories.pdfIn PDF document text
    • http://blu-ital.space/wuzemubeueiee.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/ahjhiL7/48031329827.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/C6jizx6/i_don_t_know_cartoon.pdfIn PDF document text
    • http://best-ital.fun/69102617349poodc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejados/al_amyloidosis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/10_envelope_template_word_2010.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 5200 bytes
SHA-256: c5ce23e479f5cddde0958f69919ba6195d34a0977b4ff633c5fe946655934d96
font_01_sfnt_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 10436 bytes
SHA-256: de1dc0963c9ad60a1c0aa9b864fd9be3a8d81c893be016ca6b19bb92462c3fc8

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