Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b55dc1fad4fc4ce…

MALICIOUS

PDF

80.3 KB Created: 2021-03-22 14:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d18bad7e9a5ab0c7a4d6afc7587723fd SHA-1: 58cef3c0fb7e582857e54bd7a0faf78dcf7d45f0 SHA-256: 9b55dc1fad4fc4ceea7f74d99af0ce7167e2c6ec4e431cf0196d5715f2445a4b
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://baarspo.ru/strik?utm_term=do+percy+and+annabeth+kiss+in+the+titan%2527s+curse PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fc86b2421c75.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/78856591006.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/how_to_cook_cookies_on_a_pizzazz.pdfIn PDF document text
    • http://munupesifak.22web.org/68114960668.pdfIn PDF document text
    • https://cdn.sqhk.co/naxaroja/WGVvrgd/norwegian_cruise_line_news_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5fe3edc525192.pdfIn PDF document text
    • https://cdn.sqhk.co/lilajibusizu/hhDhjhg/48994141417.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/etmggAz/97875293295.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/cbXjjha/72447879268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_6046f03448139.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/zonebubapilutawopugodu.pdfIn PDF document text
    • http://wabesiguz.22web.org/56234295326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojapaj.epizy.com/4095131746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897ad206-1e21-434c-85a0-b33b16721b37/dictionary_of_japanese_grammar_anki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5693fd52-a5e9-4ccf-9a27-ab168f130203/tizolawa.pdfIn PDF document text
    • http://livirava.atwebpages.com/array_c_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f9e0f3-74c9-494b-9436-aab4c307805a/netuxetujepimexipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0a2a82-79a8-414d-bd40-bbfd2c634351/pememowanejivawiv.pdfIn PDF document text
    • http://gatadijimog.rf.gd/casual_leave_application_form.pdfIn PDF document text
    • http://fozanaki.epizy.com/jelugulugube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0f0fc3-35b4-4472-869c-974bb86a43a5/how_to_tell_if_your_dog_is_a_dachshund.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_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 5468 bytes
SHA-256: 5debd2f02f35e7ee4c935fe9e010ee347d1b81db7f9501181c01d94597de0454
font_01_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 10388 bytes
SHA-256: de4490877a4471803fabd1c4ff7854d703562f1c0a2cd288c010f6d0a8366a18

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