Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd0c452dc7757ad…

MALICIOUS

PDF

81.3 KB Created: 2021-03-08 20:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4143f12d0002b8f780b8ef470ed11c85 SHA-1: 7e75f19148d7bc23e58a1eeb1c28e8b38b864546 SHA-256: bdd0c452dc7757adc0b9e6f06dcf364d979c67e6379b2ee2c5fa48fbc142f4c6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for requesting recovery secrets or private keys, indicating a phishing attempt. It also includes a link to an algorithmically generated URL, which is a common tactic for malware distribution. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xajibur.ru/wix?keyword=ccna+security+chapter+5+exam+answers+2019 PDF link annotation
    • http://grandov.pro/160086280476dmzm.pdfIn PDF document text
    • http://senteber.site/bostitch_n12_roofing_nailer_partskyeog.pdfIn PDF document text
    • http://helpcreditscore.info/thrawn_alliances_read_onlinee9ejo.pdfIn PDF document text
    • http://expressvpn.store/minecraft_apk_1.8_0.8_indir39d7t.pdfIn PDF document text
    • http://trycabinets.xyz/89116930855ehdjv.pdfIn PDF document text
    • http://tricitysikhs.com/what_does_600_mean_spirituallyq2a0j.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/pfsense_install_guideg2gtn.pdfIn PDF document text
    • http://meblik.su/nuvonu0c2zi.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/230ea781-9aec-4647-bfef-35a2d20f67da/6544223901.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/77123565797.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/gojuvalujaruzomudunukine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/757309e7-8336-467f-bb5f-310a49712bf1/act_3_scene_1_macbeth_ambition_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/judevuduzimujutikav.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/rivosajadepoxogumijixo.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/how_do_you_set_up_a_winegard_carryout_g3.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/150cc_pit_bike_motorcycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aeb014e-2d99-4833-acf5-35d14fc99f20/7981109182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de00a546-d053-4e78-8e11-9baf47fe4424/three_phase_transformer_fault_current_calculation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdce7258-72f3-426a-8b41-e4bc7ded09c3/sasefoj.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_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 5916 bytes
SHA-256: 04b24b142b360afc9bc0700780f580de41ca9b4b63b329e6f47b67e43ba0d2de
font_01_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 10748 bytes
SHA-256: fb934d56d122f738b1b7855ceea061b2f93444702bcba6d4be01a60a3ae9a7b7

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