Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf2792d1ce26d52…

MALICIOUS

PDF

83.6 KB Created: 2021-03-10 01:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a0ce763899cf91991f2a23311b1edb4e SHA-1: 2042f7074f37463539e45f6efe08cc7ed9f0d15b SHA-256: caf2792d1ce26d52762b287f0a22884f915537afd6c32c655a13569ecf1aeed1
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded content, though heavily obfuscated, appears to be related to printer maintenance, likely serving as a lure to encourage users to click on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/strik?utm_term=hp+p3015dn+maintenance+kit PDF link annotation
    • http://wukivobezoba.iblogger.org/biwebik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_600ea57160daa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_60087352b29d9.pdfIn PDF document text
    • http://jivobomewez.22web.org/read_between_the_lines_answers_level_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fd67cac5b4a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403672/normal_60075228edf1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zetuver.rf.gd/jokiwipozuli.pdfIn PDF document text
    • http://wemubateba.epizy.com/pivawixubabagina.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_692f1a60bdf84a06a432fcb37d1db353.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/architecture_firm_website_template.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_9ff1dd2209724be389dfc53eff62b645.pdf?index=trueIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_73ae557e83f34e2caaf7faca931947c9.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_a9961463b61f4b0a85387d271978e385.pdf?index=trueIn PDF document text
    • http://wafogaz.rf.gd/salvation_army_donation_guide_printable.pdfIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_3f5ea8c6625747bea365d1248cb23502.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_cd960fe5519b48448715714466429b6d.pdf?index=trueIn PDF document text
    • http://tovivefi.rf.gd/samsung_dishwasher_dw80m2020us_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/acrylic_sheets_canada.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_2be47efc6bb945ada923d151731eb5ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/spiderman_spiderman_song.pdfIn PDF document text
    • http://diwomikutaz.epizy.com/passiv_englisch_bungen_mit_lsungen.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/audi_a4_avant_2009_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/how_to_make_circles_around_a_circle_illustrator.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_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 5420 bytes
SHA-256: ee04e23d9b6e5bb9c9300bee01d245fb954d59ab68944f412b614fd3cbfc7bbd
font_01_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 13432 bytes
SHA-256: 0d6146736f5392641cf1fb54d79e6519b0393109c1cde1e8f6cb56e7d4bff8f7

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