Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad77c354000a67c…

MALICIOUS

PDF

79.8 KB Created: 2021-03-23 14:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 43300ddaabff7ce89411f8346e741afe SHA-1: 5001ad06b5b8dd73d37a94bf308f7f6cab686b9c SHA-256: 4ad77c354000a67cb7c99a2f41ff62f0c7414c202af99dc93e1cb5beb1c1e5d0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded URLs, with one pointing to 'baarspo.ru', suggesting a redirection to a malicious site. The PDF structure and embedded content indicate it's designed to trick users into visiting a compromised URL, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=cell+cycle+labeling+key PDF link annotation
    • http://leopards.space/decimal_word_problems_4th_grade_worksheetsjxqdt.pdfIn PDF document text
    • http://henrysavbr.site/ti_ba_ii_plus_professional_case67dwg.pdfIn PDF document text
    • http://rejasepilibuxep.iblogger.org/budifiluzugejove.pdfIn PDF document text
    • http://nigasheff.xyz/2551936274n7hl1.pdfIn PDF document text
    • http://jobs-ingenieur.best/tagisifomemenedilonujizapadyf6.pdfIn PDF document text
    • http://wildber.store/do_i_need_a_safety_inspection_in_utah0g5wi.pdfIn PDF document text
    • http://design-kvartira.info/wuwuxuzenemidizidh9ph.pdfIn PDF document text
    • http://italywom.space/el_sociodramaebvvr.pdfIn PDF document text
    • http://silver35.ru/billing_statement_format_in_words1dvtv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nofiwes.rf.gd/lerexakajosevete.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_c0a5dc420e8149d2ab2b3c15a652ff14.pdf?index=trueIn PDF document text
    • http://xoradodi.epizy.com/auxiliary_verb_exercises_englisch_hilfen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf79d689-ad44-41aa-8056-b50aabd29138/smoke_alarm_beeping_with_new_battery_australia.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_419e0cfa71424b83a0b77cde9cbe97c7.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_c2741766ac8e4333b3d0615afbcc66ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/lapalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c9ded3-e1a7-4df3-8d5f-840ca3bcf59f/25445414859.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/xoneg.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_4847e239b6a5416c8111a8522c108fb3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ece45ce-cb59-4d18-bd3c-714fbef768b5/givosilolebufiwaninivu.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/87785620599.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_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 4904 bytes
SHA-256: 048bf2e6cddf8ce98bd6849eecc7fa38faffacc7a294f7f20b7fa72b285f2e64
font_01_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 10308 bytes
SHA-256: 0a593ad31d2dfe22be62fb4d0d01fc98cf553cf7e9856a608d3a13912caee4d7

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