Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2ec7202f7d28cb…

MALICIOUS

PDF

82.4 KB Created: 2021-03-31 01:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9db03f2ba915e6421a909e0cc703c966 SHA-1: 1aa3f99216e7794c13e8985c71fe4b90c4acd92f SHA-256: 5a2ec7202f7d28cb789d6aeee67ff9f20f88923d48e9a4bb8eb64046dad2eee8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. The embedded URLs and the PDF's link farm nature suggest an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'Consumers report used cars avoid' and 'wkhtmltopdf', indicating a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/123?utm_term=consumers+report+used+cars+avoid PDF link annotation
    • http://begdas.fun/15841954419mecq5.pdfIn PDF document text
    • http://richteam.site/3836984610425cmh.pdfIn PDF document text
    • http://damvglaz6.xyz/siladuwuragotoxomiketiluslc5vh.pdfIn PDF document text
    • http://vir-tus.com/57872785792l5jik.pdfIn PDF document text
    • http://swiss-gear-top.xyz/test_for_starch_lab_reportk9764.pdfIn PDF document text
    • http://kpovli.ru/les_miserables_musical_short_synopsis1tkwr.pdfIn PDF document text
    • http://italia-doc.space/orc_war_clash_rtsacx8i.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/fRhb9if/weedmaps_find_marijuana_cannabis_weed_reviews_cbd_oil.pdfIn PDF document text
    • http://kemytbok.xyz/17897608454xqigl.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/gdgjihE/jai_rhythm_teachers.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/dpLv3FY/899101605.pdfIn PDF document text
    • http://ovca.space/xusoginuluniwuder9wuxc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf0f80c-60ec-495f-8044-aa3d7a3103ef/tebufizora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8fab69c-74a8-40c5-95ca-8269a79b0c6c/how_to_unlock_a_kenwood_radio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92b7388-f85c-4692-aef7-e3799f81ac79/gelak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd45bdb-b4be-4783-87b5-372130a5be1c/how_to_create_a_hero_banner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b9e2cbb-66d6-4f29-9ec9-bf7bff1edc70/sugunitoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfad6e3-7d4c-4617-8ad3-f02c2fd7f389/kindle_model_d01100_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6c2abe-5d7a-4923-ba24-cb089c781650/mental_status_exam_example_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a229474-2c74-4c4f-826e-1b49224a7c40/kapinasavolufoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e23393-ee10-4268-a971-25c49ea9d594/completing_the_square_calculator_2_variables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33469d95-dfaa-4fb2-bc92-f5d3bd716ad9/how_do_i_change_the_dst_on_my_g_shock_ga_100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1409428a-c63e-4e0f-8991-c6f3f74feef3/what_is_conversational.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_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 5152 bytes
SHA-256: 99c93010271b54176b529e90bd25c60621db17dbea1792446f015ef50a84d7c7
font_01_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 11064 bytes
SHA-256: f06d6a69dcd369118f634185db4e474f69d6a9cc149dcf696c15d391a3885e48

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