Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86cdb11d3cabd34…

MALICIOUS

PDF

120.3 KB Created: 2021-04-29 10:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cb8f0c81265ef137c0ebc8946353e34d SHA-1: 3ae44ec7c1ab0d61fcd7ac84c49c04febd07f15e SHA-256: d86cdb11d3cabd343daf08ff3a87272fc4d399747ee1b389f62b362503e0324b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=actron+pocketscan+plus+cp9410+manual In PDF document text
    • http://shoppermarket.online/xezunokumimijo41sbz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_6065dcbe1553b.pdfIn PDF document text
    • http://drenajkrasnodar.ru/goruvolhi2r.pdfIn PDF document text
    • http://hiziryigit.online/kesefebakilazupowon63.pdfIn PDF document text
    • http://hurricane1.space/how_many_carbs_are_in_a_skinny_vanilla_latte_from_starbucksy99qj.pdfIn PDF document text
    • http://azorocheat1.xyz/menazelevebativub9ktkc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453332/normal_600c1b06d23b6.pdfIn PDF document text
    • http://slimerecipe.org/playboy_magazines_free_download17xqj.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/6ae35506-86a8-40d0-be89-5fc4a089a058/54112168348.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/zepuzalufowe.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/what_causes_hypo_and_hyperthyroidism.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_0ec297d4fc5a4248888857111552ab0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisagoz/plan_de_negocios_ejemplo_restaurante.pdfIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_a4760142312a450a82b1c8684b459a13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51786dc-661c-414f-acf9-2b10f8f8a363/37124948542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59724452-5965-442c-9589-d81058987190/22969480952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3871a2f8-128f-4245-b7b7-83e8e342c0c4/how_to_measure_a_cigar_size.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CE5 3708 bytes
SHA-256: cd8d5a9927aa582f5021ce34c13c43bb281be528dc9abdd2dd73ffe13cf0b5d8
font_01_sfnt_off00017a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A28 5572 bytes
SHA-256: a881cbca4ca18c420551d4b1d6b2b9cfc79270a26bfbdbd930d1c3fa653a84c4
font_02_sfnt_off00018d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D17 15392 bytes
SHA-256: 8da3883567c1cd4c7b31958166af9db5481692dfb85869f438f5ab052ae6c863
font_03_sfnt_off0001bda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDA1 16320 bytes
SHA-256: 692409b2b60e76464efe03c6bc550b6d629687a90f56041a1f0835f50626df07

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