Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eec629be7b3ce09…

MALICIOUS

PDF

74.9 KB Created: 2021-04-03 03:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2702888a41e086f9197cd272bb947144 SHA-1: cd77c373679c59e4fdae95b1cee111e35795d5d6 SHA-256: 3eec629be7b3ce09884eca571bf339143b0e0b4e8b20e6863cb30fc07f95789b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and a link farm structure. One of the primary URLs identified is 'https://seumenha.ru/strik?utm_term=vodavi+starplus+sts+caller+id'. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=vodavi+starplus+sts+caller+id PDF link annotation
    • https://vejazejama.weebly.com/uploads/1/3/1/3/131381369/guwubudirumurulafi.pdfIn PDF document text
    • http://znohist.site/351018552885vulb.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/nibirafixadaru_sikazimotiponop.pdfIn PDF document text
    • http://llloooodddd.space/cerere_demisie_cu_preaviz_2019qy4wg.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/whitesnake_fool_for_your_loving_tab_guitarra.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/jajfMij/coupon_codes_for_walmart_grocery.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/icjghak/snapchat_score_streak_record.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/metabolism_of_sulphur_containing_amino_acids.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/68725455526.pdfIn PDF document text
    • https://nogisapu.weebly.com/uploads/1/3/1/4/131453993/c3b7401e0.pdfIn PDF document text
    • http://ibkreactiva2020.com/frat_zgl_pythonth8ll.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivikonalijuto.myartsonline.com/thinking_fast_and_slow_chapter_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ce7d3b-958f-4ff4-a1e8-549e6be37826/27838443698.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/98142806661.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/gonepalag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e0cbb0-8f8e-4152-9271-2f81bcd2bd3d/42448090693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72328f6e-de8a-489f-9df7-8782f44d3b00/fuvetulikutija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d503488-6c17-4b4d-b53a-c401e565e8d7/cant_find_my_linksys_extender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19b4755-e1d2-4bbe-82f4-953870669ecb/wokonosoxajida.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/less_than_zero_streaming_english_subtitles.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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 5092 bytes
SHA-256: aa1045b6b5044bbf6a114551b48b1ffe2b4fd2309a0b771efa033099aad58e92
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 11116 bytes
SHA-256: 1db600c12c6aef54b595a84057c2ecd8a82cb3994493571a851eb773868c7d26

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