Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f2442fcb7b4ea8…

MALICIOUS

PDF

91.4 KB Created: 2021-09-09 03:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bb1f4407263cb98dfeb1b8201af0ab5 SHA-1: 0dbdea5e176de9293ee8006785f07f3823d61e19 SHA-256: c9f2442fcb7b4ea89d9e0513613036fbd6de3bdba1033fd7d371cc9a4cf3b575
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-confidence heuristic indicating a malicious, algorithmically-generated URL, likely intended to redirect the user to a second-stage payload. The ML classifier and ClamAV detection further support its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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 http://nhakhoasaigonkimcuong.com/uploads/images/files/68299369718.pdf In PDF document text
    • http://shukokai-voves.fr/userfiles/file/770067445.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/54860165688.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/17253149353.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xonanafo.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/43378949208.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/bowagadakefigojogezukariv.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/tutitepiga.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/21882966730.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/finujukij.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130c766a2f23---lukit.pdfIn PDF document text
    • http://benly-carson.com/product/files/sowovilefuwatisebu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c0028c51648bafacdefa9154de1e443e/30762898958.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210906_085955.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908124501921286.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/lotawanosivosataxotup.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludelenaminadugukivakaz.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/zukegevutaze.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/rewozatona.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/81990564840.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/xezamika.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109052031043986.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/15550583157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jungle+book+characters+tigerPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 10832 bytes
SHA-256: ff221ddba99ef40c5f1df88449b5d2a03e29313d1dd14a804213fbbf6549bb73
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 19976 bytes
SHA-256: ba45b368fef42e6f0fba3c9cb940386cccb51b394c3b0fe68c37c40454fb7628
font_02_sfnt_off00014828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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