Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fc2e87b427c00c…

MALICIOUS

PDF

97.6 KB Created: 2021-03-09 20:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 48e9d794bc205cd7e9543a5e3202b0ff SHA-1: 74df3692932ad25bd7f951ee8459bc4d07f7d123 SHA-256: 17fc2e87b427c00c071a3c5f670ad50b116325182807a179884041d174dca562
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to PDF creation and keywords that could be used as lures.

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://leonvi.ru/award?keyword=media+and+advertising+company+profile+pdf PDF link annotation
    • http://goldenframecollision.com/69393126007orz4a.pdfIn PDF document text
    • http://graatorama.fun/the_tibetan_book_of_living_and_dying_audiobook_downloadjgiaz.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/1155070.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/scratch_for_arduino_raspberry_pimke0j.pdfIn PDF document text
    • http://lightly.store/tecumseh_10_hp_engine_owners_manual67gx2.pdfIn PDF document text
    • http://spindlndou.space/traxxas_summit_1_16_battery_lifez4xhv.pdfIn PDF document text
    • http://lovotilowojixo.iblogger.org/lubasodemusejusaveteluz.pdfIn PDF document text
    • http://maxist.ru/stacking_cup_and_saucer_setpeze0.pdfIn PDF document text
    • http://health-top.ru/happiness_beyond_thought_by_gary_webercj8to.pdfIn PDF document text
    • http://piwokadewil.22web.org/homelite_weed_trimmer_string.pdfIn PDF document text
    • https://nusubilumib.weebly.com/uploads/1/3/5/3/135347333/8832599.pdfIn PDF document text
    • https://selemuja.weebly.com/uploads/1/3/4/8/134893326/9125155.pdfIn PDF document text
    • http://reduslimitalia.site/wizadisi25k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rozazidugo.epizy.com/lefuzotijugodo.pdfIn PDF document text
    • http://puwovejivu.rf.gd/19122726088.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/24775865571.pdfIn PDF document text
    • http://noxexisotagizez.epizy.com/how_to_read_index_in_stock_market.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/risuvamebul.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/33289203514.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_off00013f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6D 5644 bytes
SHA-256: fe0f9a58515746153d7a464f3decd2999d7a7f619e76ca62a39346f62b45b3c5
font_01_sfnt_off000152b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B2 11232 bytes
SHA-256: 015cdf0b8e2f0d46a0668525743d8ffb2fe23e003f47599c4a02c5efa8ba39f9

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