Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7f2b71140526d5…

MALICIOUS

PDF

74.8 KB Created: 2021-02-18 03:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 666183620ff979f20c107903e90a01b4 SHA-1: 4387b2ed03a2f722847f76a2f1a26e30c8d2e908 SHA-256: cc7f2b71140526d54200845a57f0dd171facfa1dfa67453274dd8c4eecc2dd74
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a user manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/wix?keyword=hampton+bay+wireless+doorbell+user+manual In PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/nijob-kumikex.pdfIn PDF document text
    • http://pro-komp-master.website/avail_verb_formsfoudt.pdfIn PDF document text
    • http://nely.xyz/41922552440qlu15.pdfIn PDF document text
    • http://sberbank.link/wassce_2019_chemistry_questions_and_answersku9e9.pdfIn PDF document text
    • http://madewithsunshine.com/cdma_in_mobile_computingb7viq.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/jiiahjm/ebl_diners_club_card_benefits.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_60234487b595e.pdfIn PDF document text
    • http://poroda.site/64562941173rtcd4.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/iid1a88/nhl_figures_league_player_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/chdigBY/74822890702.pdfIn PDF document text
    • http://lavkavkusa.store/8709401222r3llm.pdfIn PDF document text
    • http://apple-fruit.space/39010032467ra7e6.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/gidlwmq/87598597974.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/wewuxuviwar/nuxomilujekowab.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/amiga_os_3._9_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/wapking_qismat_punjabi_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/xuberapamifebow.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 5280 bytes
SHA-256: 5bcca15ec6fe329d0183fcf8d0ef4c4d4ca8c7d8e4fa9963a046b923770adb3d
font_01_sfnt_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 2084 bytes
SHA-256: 3ad7cd5e4f64e83f9af61ea7669b89295da5d198f6670012e3482bc852bb1677
font_02_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 10172 bytes
SHA-256: 1a4836b0f86ad88a062cd92d5441d98ebcf1336b31c8713a5467c2e276af017d
font_03_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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