Malicious PDF — malware analysis report

Static analysis result for SHA-256 88886f791bac0d83…

MALICIOUS

PDF

82.3 KB Created: 2021-03-10 13:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a8d2d22067921bb28dd8dcec9487bd43 SHA-1: 1d71ccf55ef8ddeccfa3937bc99c73b54df6ae8c SHA-256: 88886f791bac0d837c51027c21d6e42bc0726a3e3f6b71dfc83cfdd6a3798f8e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'seumenha.ru' suggests an attempt to redirect the user to a potentially harmful website. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=microsoft+word+templates+wedding+invitation+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5fdd8e9ede802.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/how_to_identify_an_ash_tree_without_leaves.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/led_tv_backlight_tester.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/what_is_a_quiet_noise_level_for_a_dishwasher.pdfIn PDF document text
    • http://mutuvukawawe.22web.org/orbital_mechanics_and_astrodynamics.pdfIn PDF document text
    • http://pizidojokinesa.66ghz.com/descargar_diccionario_biblico_hebreo_espaol_gratis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5ffd3a2b6c2fd.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/pajupijozopor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406820/normal_5fe48c453dbd7.pdfIn PDF document text
    • https://rokopopowatapo.weebly.com/uploads/1/3/0/9/130969888/67d65f23ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443610/normal_6007b0b04e407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_7ecebe635e1a4fbf989cf610423af697.pdf?index=trueIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/lee_hammonds_big_book_of_drawing.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_5b1cd4f7bd1c4fad95430a76d7a272db.pdf?index=trueIn PDF document text
    • http://dowugutupisit.rf.gd/xutimazipalisaz.pdfIn PDF document text
    • http://gisudaledusuroz.rf.gd/machine_learning_basics_free_course.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_ee8007eea726419eaa61d53615ebaeb6.pdf?index=trueIn PDF document text
    • http://xafonabikox.rf.gd/lab_report_10_integumentary_system.pdfIn PDF document text
    • http://luxixeg.epizy.com/mudujevu.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_c497716815cf4704896f024f9a4f150c.pdf?index=trueIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 5632 bytes
SHA-256: 979a4ecebea84cc2b8e8794d41cd43cd987413f41373ca88fce2de2575416d95
font_01_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 10820 bytes
SHA-256: 551e3dd662df4a5dc16016eb62468ab504f374ce0f4599351277fe320c49c0f2

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