Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c61701f254e3f9…

MALICIOUS

PDF

74.1 KB Created: 2021-04-29 13:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 35fcbd51564a79150f987949d0970f13 SHA-1: 2dfea4feb069e7bfdb468a065793cae57e8a2ab1 SHA-256: d1c61701f254e3f939959dfbe917d36274452e6ead6d300c36d2eb6c78115441
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO link farms or directing users to malicious sites. One prominent URL, 'https://kuzutuzo.ru/strik?utm_term=check+fedex+without+tracking+number', suggests a phishing lure related to package tracking. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of it being a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=check+fedex+without+tracking+number PDF link annotation
    • https://cdn.sqhk.co/duxisabaza/jaDgiii/group_counseling_skills_and_techniques.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/jjRFTOD/call_blocker_for_iphone_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jamolipa/cDjhtjf/josazigapule.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/jf4hcjc/kugikipevolaw.pdfIn PDF document text
    • https://cdn.sqhk.co/xozakatupab/gf8ighe/6130735342.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/cSeZiah/42387628278.pdfIn PDF document text
    • https://cdn.sqhk.co/raxedaninaso/jhhbm1S/japanese_alphabet_katakana_and_hiragana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/catalina_10._15_gm.pdfIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_c9f874b516994527ae5a91a797eab15f.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_066771bbd4fb4df4acfb853e8eb1d61a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daselex/fifimukivopepovarogoje.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/anchor_chain_guide_roller.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/how_to_become_a_mind_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/37025859940.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/suzudinilupafafimukakor.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/24256905387.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/t_fal_pressure_cooker_instructions.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_e4829936ea4641c29ba7b9e4d1a1b0b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/44672394016.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/graded_exposure_worksheet_get_self_help.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_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 5492 bytes
SHA-256: 9fa8f0f11af6bbedecd91a0a09dab0ab10964efab8cfce70f1756e1317fcd94f
font_01_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 10592 bytes
SHA-256: 6b1a58ec9b354e3f65bc95648d969164b3eb72c1b412b2bed73c27b98c5a7567

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