Malicious PDF — malware analysis report

Static analysis result for SHA-256 244dae7d832e7f57…

MALICIOUS

PDF

82.2 KB Created: 2021-03-03 05:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 61a9d26e32e9b42f033e321bcc4950a9 SHA-1: fdadae5005bb202fcc4203e044631f84c1e63cc4 SHA-256: 244dae7d832e7f57822cf2f34a0d0f58de173af6446d6a708e1eca84d4436f8f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=do+you+use+milk+or+yogurt+in+smoothies PDF link annotation
    • https://cdn.sqhk.co/gupuwiwi/c0diiw5/28446908953.pdfIn PDF document text
    • http://keysecret.ru/what_does_the_boomerang_do_in_links_awakening37zmb.pdfIn PDF document text
    • http://myfirstsite.xyz/illinois_state_id_number_formatlctzh.pdfIn PDF document text
    • http://autocredit.moscow/adobe_flash_player_11_archivelbdnf.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/how_to_reset_epson_l360_waste_ink_pad.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/74839637560.pdfIn PDF document text
    • http://damewumesigalut.medianewsonline.com/fundamentos_de_algebra_lineal_larson_6_edicion.pdfIn PDF document text
    • http://jibakerutev.mypressonline.com/10600260362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosigegu.onlinewebshop.net/tazarewarirefotemado.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/isolated_personnel_report_training.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/46313811202.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/nurses_drug_handbook_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/91299804792.pdfIn PDF document text
    • http://kizarepopudoso.epizy.com/fugexufidijuxopewejesome.pdfIn PDF document text
    • http://warazasi.epizy.com/zurivuxabumogoxisesol.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/new_bollywood_movies_trailers_free.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_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 5056 bytes
SHA-256: 9e0ee2abec6626e872d10ac34a6e6b5877698409df611f4c1b944f7848e64260
font_01_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 10672 bytes
SHA-256: 08585d83facce1e1f5c3c4618a06d99199d4ca69f70b0116dd77db50dda45bc4

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