Malicious PDF — malware analysis report

Static analysis result for SHA-256 285952582ec1c4f9…

MALICIOUS

PDF

82.3 KB Created: 2021-04-24 14:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2fdac3515436ec2f35d78ebb5df9538 SHA-1: 98dadae87b0e2cca0948dc9478c3390547a0f86b SHA-256: 285952582ec1c4f9f8531f28023e528a972b4c822241054eb5233d73658dc4f0
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The presence of multiple disposable hosting domains and UTM parameters suggests a phishing or malware distribution campaign. No scripts were extracted from this sample, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=tissot+t-touch+connect+solar+smartwatch+mit+titan+armband
    • http://bexukavinawexov.mygamesonline.org/afterthoughts_on_visual_pleasure.pdf
    • http://jikifikizipi.22web.org/papizavoguz.pdf
    • http://dawezedelofeda.scienceontheweb.net/beats_studio_headphones_black_friday.pdf
    • http://natewisuwosat.iblogger.org/biological_clock_mechanism.pdf
    • http://foselosen.sportsontheweb.net/nimenepudaxubiruje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://talagolow.rf.gd/72423580790.pdf
    • http://voratibix.rf.gd/how_do_i_turn_on_my_hp_monitor.pdf
    • http://digopepu.epizy.com/45252766482.pdf
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_6f56c3b2ea5a4075b05589e3cf3be579.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8765583a-ac1c-4e4c-afe4-ba6c99567cfc/how_to_fix_the_tension_on_my_singer_sewing_machine.pdf
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_df7773356c8f4c0a9a53633405facbb2.pdf?index=true
    • https://s3.amazonaws.com/rojalexipokadaz/how_do_i_share_a_past_memory_on_facebook.pdf
    • https://s3.amazonaws.com/kigavanus/programming_language_syntax_cheat_sheet.pdf
    • http://dudijujixafag.rf.gd/putolewubodezisuvesir.pdf
    • http://nejexapef.rf.gd/bruce_lee_film_enter_the_dragon.pdf
    • https://s3.amazonaws.com/sisaxu/binomische_formel_aufgaben.pdf
    • https://s3.amazonaws.com/kukupunopedon/terativu.pdf
    • https://uploads.strikinglycdn.com/files/39e3d739-9301-4610-b3f3-94fb25751d11/what_is_intermolecular_force_dipole-dipole_interaction.pdf
    • http://kexomun.myartsonline.com/mawoluvigatebajameraluge.pdf
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_2375f404080945a5baaa4e3cc968f773.pdf?index=true
    • https://s3.amazonaws.com/debiwelof/delonghi_2000w_ceramic_heater_review.pdf
    • http://gagisejokunego.rf.gd/disputing_old_debt_on_credit_report.pdf
    • https://uploads.strikinglycdn.com/files/1c82a143-3fa3-46eb-b94a-b8e169df356f/ge_cordless_phone_battery_36154.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f201.bin
7ab765de17592290d2ab9b8ec8a285bf677e4fdc29aabef263d90106741f2464		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 5276 bytes
font_01_sfnt_off000103c9.bin
e136f1f23f1cb2b2a81005f737f9a9b1b3b84530fec30eef036f51c997b77b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 11760 bytes
font_02_sfnt_off00012ab8.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 4324 bytes

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