Malicious PDF — malware analysis report

Static analysis result for SHA-256 f242e250bdb38dda…

MALICIOUS

PDF

76.3 KB Created: 2021-04-02 09:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8c453adbfac770e881af821958c25817 SHA-1: 9d48a67a439bbf789ab0705720963c29e2da13ba SHA-256: f242e250bdb38ddaf838d8788b56c1b74fd42a86d478a426ff4ddd338fbabaa6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text fragments suggesting a report, which is likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=matrix+report+on+dashboard+salesforce PDF link annotation
    • http://lalabomujulimof.mywebcommunity.org/jazz_blues_piano_mark_harrison.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/22200903847.pdfIn PDF document text
    • http://libralab.digital/57384918358v3vrr.pdfIn PDF document text
    • http://carbackseat.site/todewujuzuvilururafojawi43pc.pdfIn PDF document text
    • http://tameenegypt.com/vonesugamesiponekipsc5pg.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/11043008326.pdfIn PDF document text
    • http://flathead.us/the_education_of_a_value_investor_bookmzw6h.pdfIn PDF document text
    • http://idealica-italy.site/rusisezabaviwopuwoxawivoc3eu4.pdfIn PDF document text
    • http://masito.space/does_covid_affect_high_blood_pressure7vvhd.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/23509192225ougfj.pdfIn PDF document text
    • http://sun-italy.space/parenting_style_assessment_questionnairealzjk.pdfIn PDF document text
    • http://mmuuue.space/mupakupotolipugouqpcz.pdfIn PDF document text
    • http://shoop-fm.ru/rijovesap7rsop.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://idealica-columbia.site/north_indian_non_veg_food_menu_listvg12r.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://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_c5fe832d14b847c6b4e169652aac7983.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1396251a-ffd2-4316-91ff-430703a53e8f/crock-pot_express_pressure_cooker_csc051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0223d778-a2c3-47ce-8d53-042432b409a6/zuzarireku.pdfIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_57f176f27c604f98a8c4385b8587bd28.pdf?index=trueIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_c91ae4cf09e744d1aaddc07353220e5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8864d42-4f02-4f45-b9d6-bac60709cba7/bloomington_indiana_recent_news.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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 5244 bytes
SHA-256: 1511ee37652a03173f456e022bc6fd5f0a2e2568ecd70d50c005d20a75da0fba
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 10568 bytes
SHA-256: 5e9756e69a25a5474b0bbc267afb98f5a94a4caef4422c92b3eb44e6a4266afe
font_02_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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