Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddfbb59f0785f97…

MALICIOUS

PDF

77.2 KB Created: 2021-02-28 04:35:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 26a06ce634776d0279af1403a04d9d09 SHA-1: 080a5f7c5f6f5d4f06edeb7756cf5a22183e387f SHA-256: fddfbb59f0785f9727d00846d134b9c8c707db82c9c44a292e604a5d6a152ec8
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

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
  • 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://fokemale.ru/123?utm_term=how+to+test+outlet+with+cen+tech+multimeter PDF link annotation
    • https://rexirarilabe.weebly.com/uploads/1/3/2/6/132681411/c0a9597ff9f.pdfIn PDF document text
    • http://konufij.22web.org/17651499322.pdfIn PDF document text
    • http://pafewubeb.iblogger.org/24203039361.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450516/normal_5fde9465d20cb.pdfIn PDF document text
    • http://opit.space/osteoporosis_guidelines_philippines01xo5.pdfIn PDF document text
    • https://konegodifoxud.weebly.com/uploads/1/3/1/3/131380175/besurawezip_sopan_bixej_nasun.pdfIn PDF document text
    • http://bovavep.iblogger.org/kill_team_core_manual_chomikuj.pdfIn PDF document text
    • http://registrat.space/997356972094tw3y.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/5878189.pdfIn PDF document text
    • http://wamepiguvoj.iblogger.org/43333894293.pdfIn PDF document text
    • https://lurufakezudaka.weebly.com/uploads/1/3/4/8/134884294/5809037.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/27561442705.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/fejemesi.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/27854948892.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/ronenitevodo/bose_remote_control_replacement_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/can_you_hear_my_heart_piano_sheet.pdfIn PDF document text
    • http://zuputes.atwebpages.com/how_do_you_restart_a_panasonic_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/new_odia_album_dj_song_2018.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
font_00_sfnt_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 4764 bytes
SHA-256: e56a8b56cc41b1cf231185230cb39e6875e2b8f27db6d86d634f6b7f7cc22348
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 10656 bytes
SHA-256: 3de31f944cd5275520448af56998f323a08a1070c7ccc6b71782dbdc4eff6619
font_02_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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