Malicious PDF — malware analysis report

Static analysis result for SHA-256 abaf9fa95b483601…

MALICIOUS

PDF

77.0 KB Created: 2021-03-10 17:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b667ad84380923043ae61fda02ebf0e2 SHA-1: 32ee8b9c750e752a234e4941bb4f7bd8a58f92ff SHA-256: abaf9fa95b483601bd9f0b623a8e09f8d432cfbe965a26f04156416e44d67dfc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'zajinet.ru', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/123?utm_term=hair+secret+dry+shampoo+sheets PDF link annotation
    • http://kusafomidufe.mywebcommunity.org/57108983505.pdfIn PDF document text
    • http://tigadugutuvatix.mygamesonline.org/56873205646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_601db84182cc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370307/normal_5ffc17ca4e3f8.pdfIn PDF document text
    • http://salonly.xyz/41297908668g5stc.pdfIn PDF document text
    • http://drive4mclaneaustell.com/16280030825owosg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449205/normal_5fe33aa057523.pdfIn PDF document text
    • http://magnetfix.store/morezutevd0uc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_6044d873c2219.pdfIn PDF document text
    • http://scriptbook.xyz/nova_launcher_apk_2019xvfkl.pdfIn PDF document text
    • http://websecurer.tech/85869494686mxkno.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/online_quran_text_with_urdu_translation.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/converter_para_musicxml_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444877/normal_5fcce12b5895f.pdfIn PDF document text
    • http://maska-respirator.com/51697431293s0bdt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_601749670d19b.pdfIn PDF document text
    • http://virona.org/66231513399csgyf.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/4384a62b-51f9-4a5c-b0fd-22958a67763f/6203927583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e59f96-42d3-4966-a72b-3ade5230b168/ganukefujirorubeseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15501dd3-61df-43c2-808a-3f3b16dd77af/xaxufejabogowikig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78278a3-1f4e-4d01-9449-3c12da15d7ab/who_came_with_the_bible_in_south_africa.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_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5344 bytes
SHA-256: c993017affbe0c903802c5295be907dd78378b5693609b5f1d5c37a8dea7c459
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 10240 bytes
SHA-256: 5c35319d253b23aca2bd7e22d02205a0f3cf383ac67d6e6e70fa8318ca97e153

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