Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b2b3ecbc7e6409…

MALICIOUS

PDF

76.4 KB Created: 2021-05-17 18:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c76e15d723e46024983448a16ab0e6f8 SHA-1: 999f58da2d3b3c73c082b233166137764734df28 SHA-256: 56b2b3ecbc7e6409fe67d3e2eb96341df7c8e73338901b3c65e311aab486fe63
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 0.9998

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://maypoin.ru/strik?utm_term=chickens+come+home+to+roost+quote PDF link annotation
    • http://moitender.org/23375900869xneri.pdfIn PDF document text
    • http://mon-cmso.best/is_end_of_watch_on_netflix_2019zxc4k.pdfIn PDF document text
    • http://varuzajuv.22web.org/mubasufuronokupojoz.pdfIn PDF document text
    • http://sethel.xyz/9648152467749xsz.pdfIn PDF document text
    • http://stepka2016.xyz/nonagazofasirezopakagovo7kpdy.pdfIn PDF document text
    • http://4gusevshop.space/ratalusowomazisetirisj2w1k.pdfIn PDF document text
    • http://site-shop.xyz/ziruwazebhyiu.pdfIn PDF document text
    • http://leopolds.space/wings_of_fire_free_download_in_kannada4lypc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/wosipuzobej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ec78ee-26f3-4445-8cbf-4fe2ed8a11ed/xoluxaruwurilezob.pdfIn PDF document text
    • http://diwozonez.epizy.com/7875841802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414a2602-47a0-4cd2-814d-d2afd5a4b2c6/72696482915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70dd5d8a-0ae1-432e-abc8-13ea08b19125/3658380591.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_3f17d11a7dcd4dc98649c07cf9ba398c.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_e2c1a88302d7473d97f85501bce442db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/49577237263.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/mini_cooper_s_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/xaxafitagilirazoke.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_673cff1fdec74bde8dfde1611c305df4.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_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 4892 bytes
SHA-256: 58a16dcfe1faac46b576d62c2bccb12194d86f792ac4463866c5f6ceb3588073
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 10676 bytes
SHA-256: 0cfc89ba2aad9d2bf2dead4aca61b5d5bab437856c1ac0763a41d1007f6e7573

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