Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15121877ba42738…

MALICIOUS

PDF

81.9 KB Created: 2021-04-10 03:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 70820d4e162d7d7b4e4c13e9005d8dee SHA-1: 86963f4e53de04d54d7d524c70a524d809df6705 SHA-256: e15121877ba4273884bc862804a91f4ea47b10cfdad629dec1a4b68534bd6d9a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'resalured.ru'. The document body, though partially corrupted, suggests a lure related to 'knowing when to walk away is wisdom quotes', which is likely a deceptive pretext to drive users to the malicious link. The presence of multiple disposable hosting links further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=knowing+when+to+walk+away+is+wisdom+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461746/normal_600ba93331b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_606423717f18c.pdfIn PDF document text
    • http://awpmode.com/java_programming_for_freejwv8j.pdfIn PDF document text
    • http://mivetys.xyz/how_to_set_up_fender_mustang_1_v2myg3e.pdfIn PDF document text
    • http://goodxday.xyz/tojutiviwajuxiip0fm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_603f340ebff5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421038/normal_6002a693e602d.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_6014027ee47e7.pdfIn PDF document text
    • http://keepqifi.space/52658886827n41e8.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://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_176319a0652d4296a63f3e8bb8e6a98e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5fb1b2-057b-4f2a-9467-2574707bcd69/45366702424.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/asthma_guidelines_bts.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/avm_studio_raipur_cg_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae840822-bf49-444e-8112-05ee4e2e6e78/73771151617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f862c54b-376e-4934-9f1e-82fd9d24596b/why_do_tectonic_plates_move_convection_currents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f84016-8821-460c-9ae1-2fd109529c9b/why_is_my_refrigerator_making_clicking_noises.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/bose_solo_15_remote_codes_for_sony_bravia.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/bamojabiwof.pdfIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_7888324f85904c718017b9b1c248efc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52d486aa-67be-456c-b817-e893383de0c3/fuvemafel.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_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 5380 bytes
SHA-256: 98b9ebf1af49074783a371b30d9798b4fe3425ca31d675ffc82e9109d385b07b
font_01_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 10680 bytes
SHA-256: 7c6a87f519bdc14193639f174d1fbed5d001fe6faf6db112a6dd5232257f8f42
font_02_sfnt_off00012b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c