Malicious PDF — malware analysis report

Static analysis result for SHA-256 5310e2c6ccf8e88e…

MALICIOUS

PDF

97.0 KB Created: 2021-03-12 16:35:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4908eb7de06523f6ad637810a856cd1e SHA-1: b22a5c4b1af46d71b5e40377b4f496a6a553a43c SHA-256: 5310e2c6ccf8e88ece614843ddbf7f8add1d8b2357984d065d34d6d495b0a3b7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=levels+of+classification+biology+worksheet PDF link annotation
    • http://4kuhd.me/buwudaxigojogamopuzpy4m6.pdfIn PDF document text
    • http://obmenkalnr.online/how_do_you_reset_voicemail_on_nec_phone7vtj7.pdfIn PDF document text
    • http://copyrights-notices-helps.com/what_are_the_4_types_of_poemsbl8ee.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/hbyggMp/94998738046.pdfIn PDF document text
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/megisikon_xavonijudivur.pdfIn PDF document text
    • https://wojebera.weebly.com/uploads/1/3/0/7/130775791/kotuju_litabeteguvorib_vesigu_saxutabugufisi.pdfIn PDF document text
    • http://life-news.tech/40473631918rmwnk.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/jhge8z0/rurapajefofowiwisifora.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/9863579.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/iaQghhd/xukolajarokelijuzofu.pdfIn PDF document text
    • https://lekorasosin.weebly.com/uploads/1/3/4/6/134612915/c921de84d1b.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/hgkdiaO/zorokol.pdfIn PDF document text
    • https://cdn.sqhk.co/tadanopi/oxplhgS/7870867077.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/167ed5ae-4ae6-4906-8157-551ed79ee142/juntos_para_toda_la_vida_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86678239-7b3f-4088-9466-e38a452c2e37/65530440909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f908b33-329b-4142-9154-c57cbff710bc/patikup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b633ee96-7978-4cf3-8603-2736df0accbb/quadra_fire_classic_bay_1200_insert_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9ae228-0d7a-40cb-8dc7-54dd2322cd24/45048190405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97cb03b-8591-4a61-b50e-500755c9f6d0/what_are_the_requirements_for_cfa_level_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81922e5c-ecad-40bd-8c7e-a350d376d381/48018362519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad804bf9-6c86-47b2-bd53-9f5af3429b43/70454152323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815d67bc-8a2a-4188-b4dc-d45491c4ed7f/what_are_cycles_in_a_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66be914-4c4c-4b2a-8f10-d0667ebeda19/dijiwakunefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/127ba0ee-29af-40fb-953e-ac346259ceea/who_invented_basketball_and_what_was_his_profession.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_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 5328 bytes
SHA-256: 5b1d0ced1e1cf3268f2cf6eb92454e1264e7cd3a4174eb484338a7263fc01589
font_01_sfnt_off0001292b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 11832 bytes
SHA-256: ebc26b6fbab788e39b5e41e3c6e6e9f2df3103d059f85a32ea3c5e646c950a85
font_02_sfnt_off000151bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BC 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
font_03_sfnt_off00016624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16624 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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