Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c8e4fd6091628b…

MALICIOUS

PDF

80.6 KB Created: 2021-02-12 09:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21d596cba8d92e3daa322659ca734a5a SHA-1: 62e31c2a228b2c5273c83e18a676be4f2a35d55f SHA-256: b1c8e4fd6091628bdb4d19168cf4cd6c6b23b6ba40ae41ebc76d5a61ecc00d1c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/wix?keyword=dragon+age+inquisition+manual+attributes PDF link annotation
    • http://fitokaps.xyz/9362338636bneyv.pdfIn PDF document text
    • https://zejewovelopitut.weebly.com/uploads/1/3/0/8/130813539/wobid.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/e60e0.pdfIn PDF document text
    • http://jumbochecker.com/comando_provinciale_carabinieri_torino_nucleo_informativol5jqq.pdfIn PDF document text
    • http://jenirafona.22web.org/obermeyer_size_guide.pdfIn PDF document text
    • https://rubitolagaju.weebly.com/uploads/1/3/5/3/135330326/5238058.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/2144784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478383/normal_5fffdb675ecbe.pdfIn PDF document text
    • http://zalavsky.ru/fitbit_charge_2_vs_charge_3_dimensionsqk2lb.pdfIn PDF document text
    • http://sportplays.ru/rowenogasuliliwaef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_602205d787d79.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://kuvofefifowojop.epizy.com/apple_app_store_guideline_4._2._6.pdfIn PDF document text
    • http://mowesedapi.epizy.com/boy_meets_girl_meg_cabot.pdfIn PDF document text
    • http://tagitefidunun.epizy.com/dumuwegilanizat.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/stage_1_hypertension_guidelines.pdfIn PDF document text
    • http://nijetazum.epizy.com/ambala_movie_full_hd.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_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 5152 bytes
SHA-256: 55576a3ce757f7042574103033ae74a9ede094295ac906984fd3fe78fae5841c
font_01_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 10280 bytes
SHA-256: de721f03e34268f14a6f00d3a8b9797f200b3d2e4a22b2a946ba6ba765a2624a
font_02_sfnt_off000126fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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