Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4e0ef8a700c42e…

MALICIOUS

PDF

70.4 KB Created: 2021-06-09 00:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 17885ad3570b6378a851b430eaf87b19 SHA-1: 9ab16de2829a742636bdaf69ba9d62126a181869 SHA-256: cf4e0ef8a700c42e1ad77e114540d67d4a7a403f98de978df784f73d9f44e58c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'smidgel.ru', which is likely a phishing domain. The document body, though heavily obfuscated, contains text related to 'elimination and substitution method', suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://smidgel.ru/pbw?utm_term=elimination+and+substitution+method PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426075/normal_605bf4942b4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_6015a52d26ae2.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/8245dcff-97cd-4768-8a80-72c73c512d08/stories_to_fall_asleep_to_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e5ee63e-cdf9-4577-8ee5-1a95f4f4edb7/norman_geisler_systematic_theology.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/download_java_developer_kit_windows_10.pdfIn PDF document text
    • http://febigadeviti.pbworks.com/f/good_transition_words_for_2nd_body_paragraph.pdfIn PDF document text
    • http://bamedun.pbworks.com/w/file/fetch/144458880/gexojalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22050c0d-848b-4c35-a39c-45610d8cf82c/bikenines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a24579-dacd-4602-9b44-448b757139ea/zawoxanajapemuruxebukiz.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/why_does_my_baby_pee_smell_like_maple_syrup.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144733053/unblocked_games_6969_strike_force_heroes_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9602765f-5569-4464-a189-451b891b7bd8/how_to_write_an_evaluation_essay_in_apa_format.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144465585/logiciel_power_commander_5_en_francais.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144422958/povutonenavuxutip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10577c45-218d-41b2-b7e1-2a455981adc9/laximemafewajodixakewova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/522e38ac-1847-4978-b6e1-7fde9254cd1c/jatuvisu.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/f/4_4_practice_complex_numbers_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0f1f0e-328b-44c6-866e-15ded05fb980/mcgraw_hill_my_math_grade_4_volume_2_answer_key.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_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 5064 bytes
SHA-256: 5b59cc50f674f21a868e722808134801c496a2fe749d71c2adfd06b3f957cc3d
font_01_sfnt_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 11604 bytes
SHA-256: d8b6c55e00be241e7f106a6dff2bb04aa90fc1d3e881e3c3dc75cccffa35a2f4

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