Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fdfb0c0b36ae1a…

MALICIOUS

PDF

74.1 KB Created: 2021-03-24 17:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 099f1e766c21c8888c0e25cd8d42f539 SHA-1: cc48356fba457050fcb485c766a2064d5b10d5e7 SHA-256: 98fdfb0c0b36ae1a0561045b29e8f96bffd6189d66d5ea3e70770d4754577961
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=personal+math+trainer+answers PDF link annotation
    • http://helpcontactform.com/piwomna4hq.pdfIn PDF document text
    • http://easylearning.space/82893348151a8x03.pdfIn PDF document text
    • http://vertigoa.online/7084186794nlg10.pdfIn PDF document text
    • http://zotaravaka.22web.org/easy_worship_background_videos_free.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/domirofelpd.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/iaL4cVy/hit_bottle_knock_down_2_download.pdfIn PDF document text
    • https://jibogikufojubu.weebly.com/uploads/1/3/1/4/131438018/1befab5c1.pdfIn PDF document text
    • https://ratipiju.weebly.com/uploads/1/3/0/7/130740089/40419.pdfIn PDF document text
    • http://f1l3download.site/the_magic_of_belle_islek3lmw.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/hhjgpsj/68448362838.pdfIn PDF document text
    • https://cdn.sqhk.co/bukevexej/iidh9YO/48780356131.pdfIn PDF document text
    • http://trysoda.club/22282777597lgi0x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf1a338-f553-44f8-b4b4-abb75753aead/vidoninaluv.pdfIn PDF document text
    • http://zutotonez.epizy.com/wiluzatugepavasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a2b52e-dac9-482c-8662-cb6e79265668/68679752819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0119f96f-81a2-49e2-aa54-77d958a3f0a5/7804791987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700de1eb-9da4-4185-9be8-01daeedc8d99/18922711901.pdfIn PDF document text
    • http://sodaxubiga.rf.gd/differential_aptitude_test_in_psychology.pdfIn PDF document text
    • http://meresig.epizy.com/xawosifozamowalolup.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 5016 bytes
SHA-256: ffcfd81ee8d58470fedb5e1aa2c13b8765dc23c748c859c8437aca89125140cb
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 11820 bytes
SHA-256: aa21fb4718a783ddce327fb6a66205b04e0c054058a9bbdb0c89689369fce44f

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