Malicious PDF — malware analysis report

Static analysis result for SHA-256 620bd3ac5f83af77…

MALICIOUS

PDF

75.3 KB Created: 2021-04-13 21:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 896de0240e51c301d69c3578745fb7a6 SHA-1: da7db3243342ff4522648f49a1554ad06c7f45d0 SHA-256: 620bd3ac5f83af77e2a79a155abe66eab534cd922a36d4570bf5daf9d46ed0ce
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML and ClamAV, as malicious phishing content. It contains an embedded link disguised as a free download lure, which redirects to a suspicious URL. The document body is heavily obfuscated, but the presence of external URIs and the high ML score indicate a phishing attempt.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/strik?utm_term=what+mbti+types+get+along PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_603287acd73bf.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/Aieciad/disneyland_monorail_playset_accessories.pdfIn PDF document text
    • https://cdn.sqhk.co/gugivusofed/ifkhdgf/messenger_video_call_free_download_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/73migne/maketaxewaxaj.pdfIn PDF document text
    • https://cdn.sqhk.co/mirusopujame/CihxiVP/30809149680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_6040587fd13d9.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/Thihijt/17114347384.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/chbtujb/last_shelter_survival_mod_apk_unlimited_diamonds_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/QXUiiij/rawutijutuzumodoguwe.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/1cd2ebb8-7dea-488a-9e01-583c884ef4bb/wujomuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4081e4-3df8-49e6-8b21-a3bfff562071/94943045000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710488f2-601f-4437-82ad-bd1389077209/washington_dc_airport_american_airlines.pdfIn PDF document text
    • http://vumopigaw.epizy.com/45057659546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/440c59f5-c063-49bc-a87b-38548b5e6bec/how_to_determine_size_of_low_voltage_transformer.pdfIn PDF document text
    • http://rekitajutori.rf.gd/aprilaire_thermostat_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a77050d-7d72-41fb-9c3a-a617ac99dc1b/55565307444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b7e6b3-3a95-4a34-93c6-4c2192721b3d/47850050410.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_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 5392 bytes
SHA-256: f0ee605d9214bf6e662ead5bc67c22c3196c4d0342c5ac4965ebac7ee407bd26
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 10448 bytes
SHA-256: 6918dea5661f7422f9e43d2b36677e8f7c528c3c3d1f3fc0118dd187502c507e

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