Malicious PDF — malware analysis report

Static analysis result for SHA-256 31895b436aed0530…

MALICIOUS

PDF

89.3 KB Created: 2021-03-29 12:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: afce6b8561fbeba3e3347ef5a5d5bebc SHA-1: 5b9a90a30e8279694fac9e54a98bf8605b82836a SHA-256: 31895b436aed0530023a8d7e469b369f44b24c295ae7860c789e79808f4b9c75
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=entrepreneurial+orientation+and+firm+performance+pdf PDF link annotation
    • http://consumer-data-protection-bureau.com/267939335129uhhw.pdfIn PDF document text
    • http://specrazreshenie.com/27370566846bkg77.pdfIn PDF document text
    • http://lotto-investclub.com/162658983017476r.pdfIn PDF document text
    • http://flathead.us/kadapifebuzopifazevopebihp6kc.pdfIn PDF document text
    • http://premiumpornclips.com/ndc_engine_bearinghg4yi.pdfIn PDF document text
    • http://prodson.space/19683498510iwz55.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/bitinebaguwamelegulifik27oym.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/nQFZgjW/fake_phone_call_screenshot.pdfIn PDF document text
    • https://cdn.sqhk.co/nawovoso/gfhgLPE/dijumesipadonofu.pdfIn PDF document text
    • http://english-10.site/bengali_actor_dev_song8u4uk.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/iichhlC/jekowomogomabesudajobakaf.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/cgjhawM/91376433808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27bd5ff-f850-469b-894b-a1cf954474ec/37230641506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a6896e-7022-4aac-b8ef-23d5174549d5/remasupod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3213a2e4-8b0d-4c86-a114-234f8f35be44/used_john_deere_lawn_tractor_for_sale_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/coordinating_conjunctions_multiple_choice_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/zumarul.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/towards_understanding_islamic_architecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe67b24-104e-479b-8c1b-044099d69515/59120459346.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/ck2_haesteinn_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/once_upon_a_time_short_story_by_nadine_gordimer.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 5080 bytes
SHA-256: 50e41506c890bf01ea152c572d90b008ea0c22e0c882266e51334f1a2595b96c
font_01_sfnt_off00013278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13278 11236 bytes
SHA-256: a7f31cc1691cbf594038d70fa2a144af01275d59bf1fdd90efff7fd9ca13f4d0

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