Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90f1f881ed5100b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-05 13:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b7cd19e9670546f10de8af9671149b3d SHA-1: 20e7e2ab7d0a82d9c389663ca884a5c8e3805ee5 SHA-256: a90f1f881ed5100ba26ff3d1a23fbd8b78e1414cedd6a8c2e83364d74e6a82ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or SEO poisoning tactic. One of the external URIs, 'https://druttle.ru/award?keyword=jeppesen+private+pilot+textbook+ebook', is suspicious. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristics point towards a malicious intent, likely related to phishing or malware distribution.

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 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.
  • 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://druttle.ru/award?keyword=jeppesen+private+pilot+textbook+ebook PDF link annotation
    • http://ouily.xyz/los_niveles_de_lectura_literal-inferencial-analgico-crticompmtb.pdfIn PDF document text
    • https://linebabeta.weebly.com/uploads/1/3/5/3/135317009/wujenazategosepafona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_6010f68b8d143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367941/normal_5ffeac3254597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_5fd2546f5b4e1.pdfIn PDF document text
    • https://rovizefodizare.weebly.com/uploads/1/3/4/3/134309954/4192374.pdfIn PDF document text
    • http://7evenrp.ru/asus_tm-ac1900_firmware_flashllyfd.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://s3.amazonaws.com/bokexizometun/cheers_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/toshiba_satellite_cd_rom_driver_free.pdfIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_cd27226a0bd24a76acedd4e2e4c23c1a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/elite_dungeon_3_guide_rs3.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_0717be0f70ab451cb3892f79b4609e43.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_8b38e0f82d4d443082307fba5ecbfc10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/free_gantt_chart_template_microsoft_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/how_to_make_a_revision_mind_map.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/dolmen_mall_tariq_road_store_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/stock_market_trading_hours_central_time.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_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 4920 bytes
SHA-256: b44b1123c9041406c336f2cc07d99e48c80346b1d2dc0652cff75dac40bcedbe
font_01_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 10320 bytes
SHA-256: 5b194a448d1faf502d48b154bdee175dd895cb0c83b4d0bb92622366c5f7cb95
font_02_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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