Malicious PDF — malware analysis report

Static analysis result for SHA-256 c913a84b0fb60caf…

MALICIOUS

PDF

76.2 KB Created: 2021-03-31 10:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e4d93161535abd1b1e4e6d4914b4c37c SHA-1: 5277ad388a68759b6f5b6f16ae642a75de384bfd SHA-256: c913a84b0fb60caf5d8d7101695ff0528e409a43f9730e494e4d61f183bf67eb
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 0.9995

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://dugedepap.ru/wix?keyword=protist+and+fungi+virtual+lab+answers PDF link annotation
    • http://presentinsta.online/6422862559618gch.pdfIn PDF document text
    • http://grusha.space/strawberry_green_tea_bubble_tea_recipexxtor.pdfIn PDF document text
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/9520212d.pdfIn PDF document text
    • https://nefavegipu.weebly.com/uploads/1/3/4/3/134365482/3133919.pdfIn PDF document text
    • http://greatholl.com/36319789671yro02.pdfIn PDF document text
    • http://smartbright.club/55105702433r5ubs.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/6752571e65b.pdfIn PDF document text
    • http://topsalon.xyz/how_to_get_average_heightc8toh.pdfIn PDF document text
    • https://lujiwosibe.weebly.com/uploads/1/3/4/0/134040634/d3927e3e.pdfIn PDF document text
    • http://goproonly.com/zarabelosonep7x2l.pdfIn PDF document text
    • http://insurancecarusa.com/why_bpo_best_answersia3i.pdfIn PDF document text
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/7695841.pdfIn PDF document text
    • http://tk-time.site/64183985375skmt0.pdfIn PDF document text
    • http://prostosite.site/64557094056d6fr6.pdfIn PDF document text
    • http://trickyturkey.com/314697020130oa6b.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/0c652511-0067-4f50-a79a-072da1a51b88/crim_pro_outline_barbri.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_8e89540c4cea436abcdb9beac1fc1e08.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_ac399acf877a4f6b839d48ba127bc21d.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_2aab0f0a4366486ab1b28184fc3490b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3b69a4-c941-44a8-b39a-064050cfc584/why_is_my_logitech_unifying_receiver_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abaf295-02da-4829-afb6-682e90ce67b2/liwukusudav.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_30a2ea977a184fa2b9996bb3ca775fdb.pdf?index=trueIn 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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 5368 bytes
SHA-256: 806df70f5dfb7c3fe7aef10e05630a0623d94845404c52db0bd758c74d450104
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10884 bytes
SHA-256: b6c7c1a4d575d2203cc4b9e8059404122e6bc2c5154ea3f33097409033c92370

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