Malicious PDF — malware analysis report

Static analysis result for SHA-256 185558a61d926c41…

MALICIOUS

PDF

75.2 KB Created: 2021-04-02 09:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f29df986e6194f13b25ef29353ceb55d SHA-1: dee7a73017669c6b5afdce94dddaed91b2b18e8a SHA-256: 185558a61d926c411a1b2b91c66f1ddeae8cb891013d30f9e2cf1db41b64a0c1
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://resalured.ru/123?utm_term=steel+sheet+gauge+vs+mm PDF link annotation
    • http://seropuxaxogel.22web.org/ge_true_temp_double_oven_parts.pdfIn PDF document text
    • http://logekolumo.22web.org/job_breakdown_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_6016696dcf174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368487/normal_5fcc459caa8c3.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/kibivam.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/robodufasami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_cb0f32f4bb9e438586b3f105211b854f.pdf?index=trueIn PDF document text
    • http://desakoda.rf.gd/atkinson_dam_fishing_report.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_fe6b2e9239084e8ab8cdd882dd8f5bfd.pdf?index=trueIn PDF document text
    • http://bitezopunofiwu.rf.gd/cell_biology_topics.pdfIn PDF document text
    • http://sewevikefusox.epizy.com/how_to_get_better_at_mental_math.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_366dea53842f47f9821bcbf5b7e08600.pdf?index=trueIn PDF document text
    • http://samasuj.rf.gd/subadakovej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61fd88e-9796-4f56-985c-2e760dcf98c5/zolebewakawupupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc5a355-2637-42fe-8177-9d770a11f1a2/fovijupakukutelojiside.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_0ddbe75ef88a4bb09db5ba8380bb8985.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c84f431-0b8d-4666-b65e-da1d106ffe25/grammar_english_lessons_for_beginners.pdfIn PDF document text
    • http://fewuzefar.rf.gd/63760435170.pdfIn PDF document text
    • http://sobixuwuv.rf.gd/fetal_circulation_and_changes_at_birth.pdfIn PDF document text
    • http://vuzabog.epizy.com/bandit_queen_movie_filmywap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 5164 bytes
SHA-256: aec301b0e8d7ceb9c712e7890086fdb48d4dcd373d9181bc591b73823719009c
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 10380 bytes
SHA-256: a505871be806d6f49fcf9a0f5bbcb2e361e87942b74a904d8b926f8efc2d3647

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