Malicious PDF — malware analysis report

Static analysis result for SHA-256 4837ed5ebb415f8a…

MALICIOUS

PDF

83.0 KB Created: 2021-03-21 06:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd30120bb52ab7541b8e7630bc4db880 SHA-1: d6887fed3e339e663dfb2b3d61dd863c347f1f53 SHA-256: 4837ed5ebb415f8a698b11add065c9119701ea17622b43956138349850e354df
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL related to "bacterial cell wall structure" and another to a link farm. ClamAV and ML classifiers strongly indicate maliciousness, identifying it as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to direct users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=bacterial+cell+wall+structure+pdf
    • http://mebelintera.ru/chicago_blackhawks_news_bleacher_report5ap6j.pdf
    • http://fapepewakidij.22web.org/japanese_phrasebook.pdf
    • https://torififaw.weebly.com/uploads/1/3/4/6/134690130/8fcdb.pdf
    • https://cdn.sqhk.co/fefowofuk/7cAu7gh/kaiser_jobs_fresno_indeed.pdf
    • https://cdn.sqhk.co/pelelixixawo/ajcibwI/zarolo.pdf
    • https://pepodefaposuv.weebly.com/uploads/1/3/5/9/135992330/gemek.pdf
    • https://wafukereloxajof.weebly.com/uploads/1/3/5/3/135311523/nafugitaper.pdf
    • https://fugebigejajifad.weebly.com/uploads/1/3/1/4/131406613/savuduluvaxin.pdf
    • http://sbrf.link/3219948610i0ldh.pdf
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/7049016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_bda535d8808940a3bda3b4646d069653.pdf?index=true
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_357ccccf5dfe4f93a1fb8e56e9191e44.pdf?index=true
    • https://uploads.strikinglycdn.com/files/03546ec5-100c-4d0b-9fa9-c6c4dec9b0be/wabogusomapomusobofaduz.pdf
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_93a70a914634458eb68182ee3372f695.pdf?index=true
    • https://uploads.strikinglycdn.com/files/628f2615-ed77-4faf-9772-fa139a591b70/char-broil_tru_infrared_grill2go_x200_grill_parts.pdf
    • http://budekibume.epizy.com/film_antichrist_full_movie_sub_indo.pdf
    • https://uploads.strikinglycdn.com/files/bfe612b8-d222-492a-9e5b-ab968e642ba4/gusumetazosuvura.pdf
    • https://uploads.strikinglycdn.com/files/e8e0a040-8741-4548-91b9-d46cf1d98f88/what_is_the_role_of_a_prison_warden.pdf
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_db93d542bd6f4b09a6254d88b9331707.pdf?index=true
    • http://lasemiduje.rf.gd/tovogimefeliwosiramufevaw.pdf
    • https://uploads.strikinglycdn.com/files/9231330c-f1b5-4199-8a4b-5600bac573cb/68151373078.pdf
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_16d03d241e3d405f86631b5d21c11b1d.pdf?index=true
    • http://kijapomenenuwev.epizy.com/adding_and_subtracting_fractions_with_like_denominators_word_problems.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001074a.bin
463f978de30229c5462314a0ce1f9a173b8e66d34e18b9174c1fca04aebe17df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 5288 bytes
font_01_sfnt_off0001196a.bin
7c0fe97963f56a0e39eb66a50b5945f87ccd42c8881bf23c3146884f89ca3e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 10924 bytes

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