Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cd6ad42599a390…

MALICIOUS

PDF

91.4 KB Created: 2021-06-07 04:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56e30249bfa1006cb883ea5f9678c5a4 SHA-1: 68cd3bad5f716fbac1ae98b0ca222512946c21fe SHA-256: f1cd6ad42599a3902af08fd9d6bafbcc9b2afc1baceda7e28a99c7a04f0147d7
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, pointing to various PDF documents. The primary malicious URL, https://jottigo.ru/123?utm_term=makalah+caput+succedaneum+pdf, is likely used for phishing or SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/123?utm_term=makalah+caput+succedaneum+pdf
    • https://witufulovavivoj.weebly.com/uploads/1/3/4/3/134351467/6689440.pdf
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/5171982b527.pdf
    • https://cdn-cms.f-static.net/uploads/4449193/normal_6045c8143894e.pdf
    • https://sufosuzupunu.weebly.com/uploads/1/3/1/3/131379650/2265348.pdf
    • https://cdn-cms.f-static.net/uploads/4501054/normal_6061d22c7ce3d.pdf
    • https://kigazapaxulet.weebly.com/uploads/1/3/0/7/130774964/9738366.pdf
    • https://tunivarururi.weebly.com/uploads/1/3/4/0/134041149/6379bce5a.pdf
    • https://vetovevigu.weebly.com/uploads/1/3/4/4/134486276/powozed.pdf
    • https://zixudepapu.weebly.com/uploads/1/3/2/3/132303172/kuvig.pdf
    • https://static.s123-cdn-static.com/uploads/4482403/normal_5ff42a5b75258.pdf
    • https://fumirufax.weebly.com/uploads/1/3/1/8/131856188/4101995.pdf
    • https://cdn-cms.f-static.net/uploads/4378157/normal_5fd625c74bd8a.pdf
    • https://cdn-cms.f-static.net/uploads/4369191/normal_603e26c69d18c.pdf
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/9f4f4b435c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/363ef896-6459-487e-8020-653bf88974f5/what_settings_are_best_for_portrait_photography.pdf
    • https://uploads.strikinglycdn.com/files/a086e115-e00e-4e01-a5e6-2e90b26d35d7/gamem.pdf
    • https://uploads.strikinglycdn.com/files/29ac9bd1-a05a-44b7-8bfc-9b2188bb3e8b/1278021569.pdf
    • https://uploads.strikinglycdn.com/files/286fd2fb-9bea-4c22-8376-7f95f089cdfb/is_pretty_little_liars_appropriate_for_13_year_olds.pdf
    • https://uploads.strikinglycdn.com/files/d60480e6-2197-4186-897c-cecd52d9f253/how_to_put_the_chain_back_on_an_electric_chainsaw.pdf
    • https://uploads.strikinglycdn.com/files/563ac18a-7c95-4f07-a2a0-508df18c315b/pride_and_prejudice_2005_movie_tour.pdf
    • https://uploads.strikinglycdn.com/files/a4d2466f-d8ac-49ec-9bd6-6830bea9ad62/kotter_j.p._2012_leading_change._harvard_business_school_press.pdf
    • https://uploads.strikinglycdn.com/files/e70f78bb-f955-4953-92ae-a03e359fbace/words_their_way_digraph_sorts.pdf
    • https://uploads.strikinglycdn.com/files/75d0fcc9-2707-48ef-9262-97224e06766f/jasadanoxobijevenaw.pdf
    • https://uploads.strikinglycdn.com/files/a053ad97-6d53-41e2-a26e-5afc3a2164de/how_to_reset_your_voicemail_password.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_off00012a01.bin
a92b21938965a20908c156e76f4515a9958c157c10820328c83f02bc77560db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A01 5368 bytes
font_01_sfnt_off00013c2c.bin
d60d9d7bfa30d97e16a1c26e72a96b906391cc21e1ebff302c1bf949ef894593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2C 10472 bytes

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