Malicious PDF — malware analysis report

Static analysis result for SHA-256 c704f9cac98d125b…

MALICIOUS

PDF

75.2 KB Created: 2021-05-06 10:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a86e99b45dca16100269b3a4feb52a40 SHA-1: 41f9a556bb5c66d11cb74501d06960fa32631786 SHA-256: c704f9cac98d125b099de3e5697c75326aa159488e4faf2d7287f0156988cce8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to manipulate search engine results or distribute further malicious content. The primary malicious URL identified is 'https://kuzutuzo.ru/strik?utm_term=reif+statistical+mechanics+solutions+pdf'. While no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection indicate a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=reif+statistical+mechanics+solutions+pdf
    • https://cdn.sqhk.co/suxupijisajo/ic067jc/nyse_stock_market_watch_today.pdf
    • https://cdn.sqhk.co/nokotadi/hajajNJ/14341894656.pdf
    • https://cdn.sqhk.co/bepigulusibe/giRhjhe/voputekoje.pdf
    • https://vuxulirupam.weebly.com/uploads/1/3/5/3/135346280/477551.pdf
    • https://cdn.sqhk.co/foguwugafu/cKjjBSe/poulan_chainsaw_service_manual.pdf
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/7351884.pdf
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/toboliviwudatogo.pdf
    • https://mogoxolokelitaf.weebly.com/uploads/1/3/4/6/134645696/7485698.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wiwuxot/71254664414.pdf
    • https://s3.amazonaws.com/tosego/58500897582.pdf
    • https://a5f97fb6-6895-4a42-8c51-2de4018fe37d.filesusr.com/ugd/1eae48_0c6d135d01534e51beee18c446d75cd7.pdf?index=true
    • https://s3.amazonaws.com/wapabefizosumi/bls_aha_test_answers.pdf
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_3de78797d4344d4fb2a254b7615c1bff.pdf?index=true
    • https://366cd995-4ddf-4220-a197-7cea849caf0e.filesusr.com/ugd/947062_a349c65abb91406f96fccc9c4ffae6a3.pdf?index=true
    • https://s3.amazonaws.com/metakibeme/how_to_setup_bluetooth_on_kenwood_kvt-516.pdf
    • https://s3.amazonaws.com/petikamov/colonial_america_1776_map_answer_key.pdf
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_37d83234632b4daea06b081d3580a043.pdf?index=true
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_b789b645c6ab4a78b0d0f9432bcd0421.pdf?index=true
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_29c9f3a6810d4dbd808273a5f557a8ba.pdf?index=true
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_af5fe549976e4d94a93d9e9d618df4c7.pdf?index=true
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_42c1f92d4fcf44a6a8f1134e39f21d10.pdf?index=true
    • https://s3.amazonaws.com/xukirizugukugi/59849453454.pdf
    • https://s3.amazonaws.com/gazitif/2094948422.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/39527227928.pdf
    • https://s3.amazonaws.com/wanalovum/nofawuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db49.bin
2bf6db538514b478b3f024b3d683b7b403a97addcf937fc782c4a29241d7db7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 5188 bytes
font_01_sfnt_off0000ecc6.bin
e0cf2d0b01c94557bb2d51eaa52f1b632f9fbbb7cc54882ee3b201e1348ff142		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 10596 bytes
font_02_sfnt_off000110f1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 4324 bytes

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