Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f999bb784d38c8…

MALICIOUS

PDF

81.9 KB Created: 2021-04-24 15:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d2c3d1718529e141622e0edd02741d5e SHA-1: bd25b74838a855c272c3c135178742953a9238eb SHA-256: 90f999bb784d38c81a59bbb1b0e7d72a08d49ba7ac8a5b0c5e20c5079353387d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The embedded URL `https://nipisod.ru/strik?utm_term=how+do+i+get+my+whirlpool+oven+to+stop+beeping` suggests a lure to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=how+do+i+get+my+whirlpool+oven+to+stop+beeping PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446643/normal_5fca2c8eecd83.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/ZYrkFFK/cake_decorator_walmart.pdfIn PDF document text
    • http://xoxanuf.mygamesonline.org/vufekog.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/6438805.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5ff4ccb7e81c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458428/normal_60070ba09ab4d.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/9roijhe/16442848175.pdfIn PDF document text
    • https://femesizexib.weebly.com/uploads/1/3/4/0/134018571/1572e728f.pdfIn PDF document text
    • https://gexirirexov.weebly.com/uploads/1/3/0/8/130874239/domogesedokapisolar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459467/normal_604f2935c0def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_60118a03ef10b.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/gd5hj5V/best_funny_baby_videos_youtube.pdfIn PDF document text
    • https://nikakakuko.weebly.com/uploads/1/3/1/8/131871571/b5cf9682b993726.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/fgjzr6M/leech_lake_fishing_report_june_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kexomun.myartsonline.com/oxford_english_to_spanish_dictionary_free_download.pdfIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_21932bce294a4388a188f8900fa57b0e.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_3edb3ebb9ff14efc81d9336a6f145c03.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_7632536af48b4aad8e79f02595f52f61.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 5308 bytes
SHA-256: 4f96065b2721c7c490131a909ea09df92be18e2370bd296ab05b3f5b8fff3a70
font_02_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 11540 bytes
SHA-256: f2612404f8cdd4e76674be1f120efa6c9cbf5e904bb6a3fe587992aa21cc9066
font_03_sfnt_off00012a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A02 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333