Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f0f3661f56b255…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 20:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a4cd400d9247554051a19b3eb63077da SHA-1: 70af784a278bd22d044574436986dbcf39171fd8 SHA-256: 41f0f3661f56b255d613edc4bb3222f1e07398dcbdd33347a21785fc7c394645
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://fokemale.ru/123?utm_term=acer+projector+x113p+manual PDF link annotation
    • https://savejesala.weebly.com/uploads/1/3/4/6/134668282/591b99c04524.pdfIn PDF document text
    • http://vedakedudeloko.22web.org/nefegokoj.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/hdhiJtq/notes_iphone_xs.pdfIn PDF document text
    • http://ig-supportcenter.xyz/velag8uru3.pdfIn PDF document text
    • http://sufevar.22web.org/adverbs_modifying_adjectives_and_verbs_exercises.pdfIn PDF document text
    • https://noxurawikatiner.weebly.com/uploads/1/3/1/1/131163986/nipuvi_dawad_gudigixobex_xifumumeret.pdfIn PDF document text
    • http://libertinemodels.com/how_do_i_unlock_my_nortel_mailbox4iirc.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/cjbjgXl/autocad_3d_pipe_drawing.pdfIn PDF document text
    • https://kisetizep.weebly.com/uploads/1/3/5/9/135992433/betupatovej.pdfIn PDF document text
    • http://iclod.tech/yoruba_praise_and_worship_gospel_music_mp3_download0pbic.pdfIn PDF document text
    • http://carinsusa.com/nakablr7e5.pdfIn PDF document text
    • http://handler-autoscout24.com/sign_of_the_beaver_read_aloudz21ph.pdfIn PDF document text
    • https://cdn.sqhk.co/tupizurelir/hCia1yl/42917555613.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/93d31.pdfIn PDF document text
    • http://apparentlyopt.com/2405255201xitbh.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/kXghHjf/8d_music_player_pro_mod_apk.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/b9c9a041-f179-484d-a364-34a8e406064d/75141263245.pdfIn PDF document text
    • http://newigumumakewi.epizy.com/tudufefatunevofivopogojo.pdfIn PDF document text
    • http://bubojawafutak.rf.gd/bersa_thunder_380_plus_laser_grips.pdfIn PDF document text
    • http://bagegamejejupu.epizy.com/72013667923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4298d00-2557-4e85-b75d-bc935dfb4228/best_sewing_machine_for_home_use_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc7793a-ef84-4e71-b1b8-3809d1a0dd19/plan_de_estudios_2011_primaria_primer_grado_ciencias_naturales.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_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 5252 bytes
SHA-256: 1ba6506293943c24eeea915a1e7bb511c26d9f0f4af938f3ef715948608b7bcd
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 11796 bytes
SHA-256: 524be9c387c4f218cb58d1d54521a6ced72e5d4341945167464fb2cef6e681cf