Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff38cac0d12a2d16…

MALICIOUS

PDF

70.0 KB Created: 2021-04-30 19:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7908f83c44bcc45ae59e6c00f2e81f84 SHA-1: b4292c6116f1d7e58582aaf62a6dcbf8969e6e5a SHA-256: ff38cac0d12a2d16c65751da6e110b7ee7b82dda4683e3124d8073c68f13a167
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a book summary, which is then used to redirect to these external sites.

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 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.
  • 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://bologen.ru/strik?utm_term=ranger%2527s+apprentice+book+2+summary PDF link annotation
    • http://alsamcctv.com/8541539090wjtx2.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/frrghVE/mermaid_themed_strawberries.pdfIn PDF document text
    • https://cdn.sqhk.co/perekowemo/AuijOKM/fukatugumub.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/2ifRD1z/in_share_share_app_and_file_transfer.pdfIn PDF document text
    • https://cdn.sqhk.co/ponajadu/Lghhdif/movie_theater_hollywood_16.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/gi3LsLv/lakewu.pdfIn PDF document text
    • https://cdn.sqhk.co/naxibibu/jeTwDjc/emergency_contact_form_template_free_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/ugha54m/wazijabikujatoduvupofiten.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/diary_of_a_wimpy_kid_the_long_haul_jeff_kinney_summarypy2zt.pdfIn PDF document text
    • http://itmax.info/what_are_the_seven_spirits_of_god_referred_to_in_revelationst6hyy.pdfIn PDF document text
    • http://powerpoint4you.ru/xugivirafifumipy56i.pdfIn PDF document text
    • http://onatural.space/jetasanuxakovulowi8irpy.pdfIn PDF document text
    • http://100naturals.fun/android_notification_channel_example_githubmlqqo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_d8af0776be3a44c0ae2d73dd958493ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/panugedubepeposazo.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_dce6332b41264c9792e82d1a4ad13d34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/the_primary_purpose_for_developing_a_business_plan_is.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/online_translator_portuguese_to_english.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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 5700 bytes
SHA-256: 472f4a1028ebe85c1f6dd633b555b8a808a24b4a7d52b1f2064c1c5aad782768
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 9860 bytes
SHA-256: 7a1bce2edd5c484ca324dd1d549c6782bab564ee8f78078f4d134c26ff57921e

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