Malicious PDF — malware analysis report

Static analysis result for SHA-256 491fb2e88fb674c8…

MALICIOUS

PDF

80.6 KB Created: 2021-01-23 12:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f9dcffab183fe4a7f9ba786af32246e4 SHA-1: d2384bc860c1735d0fb192533aced9f155a6d177 SHA-256: 491fb2e88fb674c85b6a997cae29390c40ac98efd21f02d608c63207ffdc3579
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The heuristic 'SE_URGENCY_LURE' suggests the document may employ deceptive language to prompt immediate action, further supporting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/aws?utm_term=writing+a+formal+business+letter+in+spanish PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490367/normal_600b64456acc2.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/57058554052.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/jegfjdQ/xakosoxufopumovexojiwimed.pdfIn PDF document text
    • https://site-1243712.mozfiles.com/files/1243712/48959497056.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/aNtghjf/kiko_run_mod_apk_net.pdfIn PDF document text
    • https://site-1179246.mozfiles.com/files/1179246/gun_builder_3d_simulator_mod_apk_revdl.pdfIn PDF document text
    • https://site-1175238.mozfiles.com/files/1175238/genose.pdfIn PDF document text
    • https://degugelusejife.weebly.com/uploads/1/3/2/6/132695568/4df2b34c24.pdfIn PDF document text
    • https://site-1179000.mozfiles.com/files/1179000/vafedekokevizarezade.pdfIn PDF document text
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/1f7ffd41386.pdfIn PDF document text
    • http://notudokebifapaf.22web.org/xevumebola.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/6312678.pdfIn PDF document text
    • http://legivupipofu.66ghz.com/58074898888.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/hHsFpgd/49615814895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dilalixurapa.epizy.com/cengage_learning_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/free_thesis_presentation_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/amendments_1-_10_worksheet.pdfIn PDF document text
    • http://vowafipefazasex.epizy.com/mupajedirajewelogujadozo.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/78536471637.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_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 5468 bytes
SHA-256: a7d6f245416fafced0ebc61ff81f65f43308d67245da2041cd965f19152e3fd4
font_01_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 10396 bytes
SHA-256: bc019e18f9ed840ff667e4242495a608a6cf585109f82873b90c22767f9eab26

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