Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5a5ad45747d5b9…

MALICIOUS

PDF

81.4 KB Created: 2021-03-13 15:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6330e9b1f1c67ae2e3e8f51a0e0183be SHA-1: b6ac0791f61532e9af6eeb088f9bb81e44c59f35 SHA-256: 6b5a5ad45747d5b9c8e06bc7534d282bddad9d1fc1cec415169854005707aa73
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic indicating it is a phishing lure, specifically using an image to redirect users to an external URL. The ML classifier and ClamAV also flagged this file as malicious. The primary IOC is the external URL which is likely used to host a phishing page or download a second-stage payload.

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://zajinet.ru/award?keyword=annals+of+probability+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383698/normal_6000c809668ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_6014bd857c7fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_60265d6dd850f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368741/normal_5ff925561332e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469355/normal_5fcf01f4d6b63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_600b383702686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_6035752c3fd6b.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/2482b73b-993d-4815-b4cd-4c5ce21e2eef/hip_hop_drum_beats.pdfIn PDF document text
    • http://vadepik.epizy.com/comodo_antivirus_linux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1326a4cb-ab99-4423-96fe-5529c60952f7/revogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18664f14-0972-4e8b-95a0-04e6ba5889e9/54196835580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71939ccb-4f43-4796-a613-7ac70918f92b/the_greatest_miracle_in_the_world_audiobook_free.pdfIn PDF document text
    • http://zojopek.epizy.com/33726985182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea14e7be-80d2-4624-a38f-ac06247a0749/xaremunefetix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/747d3eb4-12a2-4adf-99e0-45a39f2fccf7/ms_project_2010_free_download_with_crack_64_bit.pdfIn PDF document text
    • http://jegelafaxorew.rf.gd/75860526923.pdfIn PDF document text
    • http://voniziveput.rf.gd/datisajagoribobijuxekuwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 4936 bytes
SHA-256: f4d42d342cc7d5383e3dc35db37acffa8be36b70a55441126ae086ca23ded0e1
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 11864 bytes
SHA-256: ee21f73712176ec3e5ea93d974ae8f21009a100d6e9a6d62edd3ecdcc1c6f023
font_02_sfnt_off000128b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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