Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d88b4eb7e569dc…

MALICIOUS

PDF

79.4 KB Created: 2021-02-26 17:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 517f97911594191f1d55dd8d7663eee9 SHA-1: 869cf38e4b19109b0422e5ae274174e9f08d70b4 SHA-256: f1d88b4eb7e569dcbbb927af3a2f354506da470e05d58a3785369741995a24c9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to contain metadata related to biological processes, likely as a lure to attract clicks to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=diferencias+entre+el+proceso+de+ovogenesis+y+espermatogenesis PDF link annotation
    • https://cdn.sqhk.co/gigijuke/IMtzhe8/3836551458.pdfIn PDF document text
    • http://moreprodukti.com/talonro_geffenia_farming_guidei8pkj.pdfIn PDF document text
    • https://tiwozujipi.weebly.com/uploads/1/3/5/3/135317022/xokafigosinup_zebokejuzubet_lorexijixeribol_jojobu.pdfIn PDF document text
    • https://galevegu.weebly.com/uploads/1/3/4/5/134507196/56ae95aa.pdfIn PDF document text
    • http://shoop-fo.ru/alter_ego_a2_s_exercer_answershfiki.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/b0cb41.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/aijif1M/8811060749.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/athfihK/ark_survival_evolved_review_2020.pdfIn PDF document text
    • http://gazzsheff.xyz/sapujozaju5nol0.pdfIn PDF document text
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/fatutenirevin.pdfIn PDF document text
    • https://libizegenumejav.weebly.com/uploads/1/3/0/7/130775388/412315.pdfIn PDF document text
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/6861775.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/how_many_types_of_dopamine_receptors_are_there.pdfIn PDF document text
    • http://flylovel.com/dos_batch_if_examplesn28sa.pdfIn PDF document text
    • http://biotringel.shop/ledazemofenulezuvegxme3.pdfIn PDF document text
    • http://organic-ita.space/612567638117qkwm.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
    • 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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 5424 bytes
SHA-256: 3cca0e70279586f6f62d42bca43066bd456a5e6f81892493fb0fc8d2e77c7548
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 11820 bytes
SHA-256: fddb2bebd10b09f916ce5799b69bd4b8ad2cfb274261a765dacef1854e779838
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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