Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b16ac4f4b453f5b…

MALICIOUS

PDF

66.2 KB Created: 2021-01-23 23:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a45fd6b9d5b07b783aa9291ec4db4c82 SHA-1: c8b4e766cb5af6ccd7bfca084cb29c21244cc6eb SHA-256: 8b16ac4f4b453f5bfb1fe45443ac8939e757c54027325336ab651cb4976ef365
274 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains multiple heuristics indicating phishing and redirection to malicious infrastructure. It impersonates Gmail to lure users into clicking a link that leads to a redirector, ultimately aiming to steal credentials. The document also hosts a large number of external PDF links, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/9218313.pdf.
  • 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://traffmen.ru/123?utm_term=proportional+and+non+proportional+linear+relationships+worksheet In PDF document text
    • https://cdn.sqhk.co/jagapifa/iiOZHge/animal_cat_ringtone_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387427/normal_5fc9280f29ae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_5fe93a463e05a.pdfIn PDF document text
    • https://site-1171473.mozfiles.com/files/1171473/31186701391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462065/normal_5ff3b3f71e6ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477658/normal_5fc5ecc1e4062.pdfIn PDF document text
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/9218313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447630/normal_6007fc07b19c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446931/normal_600687eb5ddb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5fc843c07ebc7.pdfIn PDF document text
    • https://site-1174864.mozfiles.com/files/1174864/music_video_maker_online_photo.pdfIn PDF document text
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/dujafonamesos.pdfIn PDF document text
    • https://kagebavewijove.weebly.com/uploads/1/3/0/7/130740568/kawumiwobuku_denaforakupeji_zixeze.pdfIn PDF document text
    • https://site-1175602.mozfiles.com/files/1175602/collision_reporting_centre_sudbury.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446789/normal_5ff3e00ebae08.pdfIn PDF document text
    • https://site-1166710.mozfiles.com/files/1166710/wuliruvujo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC502 5204 bytes
SHA-256: 9156d2e585f95afa6e12abb7c38a966285da457b0e2b57d0bb093c99430968ac
font_01_sfnt_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 10712 bytes
SHA-256: 42491777de890702cd0e48f4da17f2e8b166a9958a2eebf9def2870affd0c240

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