Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed8a8d25a389089…

MALICIOUS

PDF

81.0 KB Created: 2021-06-01 10:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d3561dbb7a40a83bd77f1acaf5720c9 SHA-1: d5442ec939e83cfb691702d7111fe203221ddc3a SHA-256: 5ed8a8d25a3890898899e7d33d48d455317a328e0c94326fa6abc1bc20234abe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/pbw?utm_term=21+day+weight+loss+challenge+lucy+wyndham
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5fdd972c7ce22.pdf
    • https://cdn-cms.f-static.net/uploads/4410983/normal_604384ae78413.pdf
    • https://cdn-cms.f-static.net/uploads/4461780/normal_601bc3531ba2d.pdf
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5fe6ba70ddd80.pdf
    • https://cdn-cms.f-static.net/uploads/4449421/normal_604e739465709.pdf
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/4560153.pdf
    • https://static.s123-cdn-static.com/uploads/4458431/normal_5feb7e3401327.pdf
    • https://selijexobava.weebly.com/uploads/1/3/1/8/131856120/f973d69e.pdf
    • https://funudenor.weebly.com/uploads/1/3/4/3/134319253/nepazagunejaf.pdf
    • https://static.s123-cdn-static.com/uploads/4449603/normal_5fca212fb9337.pdf
    • https://cdn-cms.f-static.net/uploads/4470972/normal_6059119c05222.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/10fcad86-ee6c-4267-8e6d-d29f1adc9af8/how_to_clean_chicco_nextfit_zip.pdf
    • https://uploads.strikinglycdn.com/files/8101a5ec-e25b-447d-bcc5-1a002f87c3c3/xfinity_remote_codes_for_westinghouse_tv.pdf
    • https://uploads.strikinglycdn.com/files/370d1c09-cbfa-495e-a74c-7be7348a4bdc/88434355529.pdf
    • http://mefijunov.pbworks.com/f/38299280003.pdf
    • https://uploads.strikinglycdn.com/files/13066dc1-8cd5-4f42-9a06-e1bdaf1221ab/77438196013.pdf
    • https://uploads.strikinglycdn.com/files/74eb9b48-214f-489f-95d0-97f03a65114b/will_ps3_media_remote_work_on_ps4.pdf
    • https://uploads.strikinglycdn.com/files/907b53e7-d16c-4b0d-83ce-74ff0c87d219/vicks_mini_filter_free_cool_mist_humidifier_cvs.pdf
    • http://paderukut.pbworks.com/f/xujojug.pdf
    • http://fosirodovo.pbworks.com/w/file/fetch/144439344/how_to_enter_likert_scale_data_in_spss.pdf
    • https://uploads.strikinglycdn.com/files/53a48146-1b1c-40c1-9eb6-5532709df114/classic_world_plus_apk.pdf
    • https://uploads.strikinglycdn.com/files/03fd93c3-80d9-469f-8e7e-36e54c08348f/zinerewita.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feaf.bin
8826b92cdc61090e388f4270d821b8842fd678a64d2dc0a7195866bd988f073d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 5540 bytes
font_01_sfnt_off00011186.bin
aa91386e3b2e31d8e8ad1e0dfe73f18f9fbca499da8f34e2dff180a554739d17
pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 11144 bytes