Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7892cf3b4c47e84…

MALICIOUS

PDF

86.9 KB Created: 2021-01-31 01:30:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6d4e328aaed8d4dd9fbe5b5926190448 SHA-1: 148067db252d48422f07ba137b8786e599932802 SHA-256: d7892cf3b4c47e84ff11c996071a9b93ad8e8db12a19a44d640f76ec8de6922c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous external URIs strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/aws?utm_term=al+jolson+anniversary+song PDF link annotation
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/bebeworoduji_tuxenavidiwono_razadisup_xedijupefow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5ff545413f83c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5fef0bf6a85e6.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/bilijemowetusevejuma.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/jgDichc/rugusufabijokebug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fc779565e707.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/exhigSX/great_battles_medieval_thd_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/bivosozos/eljaLVp/86016867118.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/454883513290qhht.pdfIn PDF document text
    • https://cdn.sqhk.co/wisivelu/ak7d3nP/31069511459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470981/normal_5ffb205c3cb58.pdfIn PDF document text
    • http://itdiscount.info/65449157720mr4a2.pdfIn PDF document text
    • http://im-marceting.site/nixabamofalututugapajipulaydks.pdfIn PDF document text
    • http://komarovskii.xyz/pocket_door_handles30n3e.pdfIn PDF document text
    • https://tawigijonepoter.weebly.com/uploads/1/3/4/0/134012415/83ed75c09e399.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/xamofazisize.pdfIn PDF document text
    • http://supportcopyright.net/86101366806ynnuk.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/j6Tidb7/lupoturaxixokarugezes.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/wemazun/a_p_aging_detail_report_quickbooks.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001240c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1240C 24764 bytes
SHA-256: 0ce97bc7c307d0727464d446a2e88bde83d7ae20e324c5144c3f08f5fc1997be
font_00_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 5080 bytes
SHA-256: 93d829ae966a8822082ee2ff8e7f6fb67a6ff9e78074d6db1cdc6c4bc99c88de
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 11316 bytes
SHA-256: 8fa9d410daac40f7d4fb1491b5ec9e4f7c4a731bc0cc318f4c33d5eb45474071