Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fdd24e77734606…

MALICIOUS

PDF

96.5 KB Created: 2021-02-07 22:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1490632c8a17ef0a03379c8657dd9b4f SHA-1: 21846742efde5d7dde9501d0553ce045e0b08208 SHA-256: b6fdd24e7773460637d0955181d12c729aa0c7d5ea8440e44966d7e23cfd9fdb
154 Risk Score

Malware Insights

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

The PDF contains malformed streams and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wb?keyword=kultur%20rotifera%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5fe4a0ad4a5b0.pdfIn PDF document text
    • http://bogplaktnc.fun/merge_dragons_chest_guidekpc2h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416502/normal_5fd03b19c1c24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389805/normal_5fffee2d9639c.pdfIn PDF document text
    • http://tehnotop.space/mokedakelepuwi19k1b.pdfIn PDF document text
    • http://fitnesspack.net/33782368914q9e8e.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/c4YYnLq/the_building_game_realestate._com._au.pdfIn PDF document text
    • http://kyrgyztours.com/wukurapovugunitofulagujfi.pdfIn PDF document text
    • http://polokuvek.iblogger.org/54840751846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_601ec594cde2e.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/eMfgdhd/xavetinosa.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/Gighjci/7742581179.pdfIn PDF document text
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/poxugumusilodijolu.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
    • http://tumuxisirawev.rf.gd/contoh_report_text_kelinci_beserta_generic_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/fubowapupuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/lekobisunozuxi.pdfIn PDF document text
    • http://siwojanapav.epizy.com/tedagabiwifo.pdfIn PDF document text
    • http://medojowibapij.epizy.com/tarunogifepejosurad.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/extempore_topics_with_answers.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_off00012f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 4604 bytes
SHA-256: 41711bd3ce729cf2667334f1591fa5ecc69c0782f23da7b1821f3753866f4ea0
font_01_sfnt_off00013f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0C 11876 bytes
SHA-256: 304c8cf3e3935c0067fe88bc8a1741fbe614a9e1db32dd0947beeb497a093702
font_02_sfnt_off00016693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16693 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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