Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc53e71e10ec82da…

MALICIOUS

PDF

79.2 KB Created: 2021-06-05 17:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 42ca729670bef558fb62cf8e286eaafa SHA-1: 122c2435f5caadac687b61865e6736d39e90e4c7 SHA-256: cc53e71e10ec82dad467267ad42822d5887f020513c5cc6cde34029a004c7767
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs, including one with a UTM term parameter, suggests an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crewmak.ru/pbw?utm_term=metodologia+de+las+ciencias+sociales+esther+diaz PDF link annotation
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/f631887c46bd27.pdfIn PDF document text
    • https://dubujede.weebly.com/uploads/1/3/4/6/134607356/jojomabuzasore.pdfIn PDF document text
    • https://lunokebu.weebly.com/uploads/1/3/4/6/134648327/4cc9060b0fec0af.pdfIn PDF document text
    • https://begiruxuvasepi.weebly.com/uploads/1/3/5/3/135351124/05ab274d24678.pdfIn PDF document text
    • https://guxenakab.weebly.com/uploads/1/3/5/3/135393472/baa63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/36aaec0d-7ab4-4f6d-bc82-c50ff083e758/who_originally_translated_the_bible_to_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e66f683-a3e3-4d8e-a622-eae64e09103a/grammar_and_composition_handbook_grade_7.pdfIn PDF document text
    • http://lojefizowoj.pbworks.com/f/how_do_you_fix_a_metal_gate_that_has_dropped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842ddbba-8953-4016-b8ff-9efcfafdeef5/37752157784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a952ba-f93f-4c1d-8a3f-c94397267091/how_to_connect_philips_tv_to_wifi_without_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73beb9a6-53ac-4e6d-80e2-7b8e0e8a543c/annovi_reverberi_pump_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0d3e07-e973-4a5e-af15-233880461c6b/time_of_contempt_summary.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/33645717288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64862742-c2b1-4fec-901d-8047fda341bc/a_light_in_the_attic_shel_silverstein.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd430c0-d0c8-4c75-b1bf-42822a60027c/tawilogofekefuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd939cd-0052-4c72-80c4-09389d33076a/what_kind_of_compound_is_potassium_nitrate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319641d8-4413-448b-8550-8ab7e767ba4b/joludeviletigamibiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7606ed4-a84c-47ee-87b1-dda16adcca80/67924729664.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144477657/35613878623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd30f749-f565-48ef-8517-4c5ff3d6f976/resistance_band_training_exercises.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144578730/solucionario_probabilidad_y_estadistica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8ff5b4-de12-47a6-a27a-c650c14b95e6/what_is_greenhouse_and_its_effects.pdfIn PDF document text
    • http://gitefov.pbworks.com/w/file/fetch/144458151/11675045941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3726a8a2-a684-45df-a148-c2d15ca90edd/39459055016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 5044 bytes
SHA-256: afd15a45f9cabf544f981c15c1d01a0aaf31b8b3584b8878072972daf83a64b6
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 11960 bytes
SHA-256: 3937c44b19935e5aa3437e901c8cc82d820cfdcd358049c87f92fdf6ed94909e
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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