Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3e9a44cc6d7ead…

MALICIOUS

PDF

81.1 KB Created: 2021-05-04 13:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: beeadcd6607d9406c1efd3223935577d SHA-1: 64ccef1f233026a9504ab319e2f9066fb34aadb9 SHA-256: ae3e9a44cc6d7ead2c864e59f260b92142d1f0740f15f557a18dbc62f5c387af
186 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a redirector, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=pascal%2527s+triangle+formula+example PDF link annotation
    • https://nimidakotogala.weebly.com/uploads/1/3/0/8/130874585/6225ef6.pdfIn PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/nilute.pdfIn PDF document text
    • https://zisafidavilux.weebly.com/uploads/1/3/2/8/132814196/vamigo-nineza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_60362298eed3a.pdfIn PDF document text
    • https://gizalikujaxemif.weebly.com/uploads/1/3/4/6/134606641/sinixazubisuzes_wakatifenuzavol_fazabigizumurul_nekuxoresipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426695/normal_60641300dd973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5ffa44415527e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_60315b1f41a39.pdfIn PDF document text
    • https://memuradudemi.weebly.com/uploads/1/3/4/6/134656273/c57b9da9d6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466143/normal_5fef478aa07b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_60433d7179f22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_5fd3a336dc1d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/causes_of_smartphone_addiction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e62fbe-67ca-491c-924a-c7f49cfdcf33/romeo_y_julieta_churchill_cigar_single.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b4036b-bd07-48b8-bbbc-f2c53e5c1f88/60851551875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351ca824-19ab-4844-894d-95598ba6e15a/62532741131.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/lauren_kate_fallen_series_6_books_collection_set.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_8d1b531fe90143ada910ffb9bb48cefc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b8ae81-bac6-4bc1-a9b3-4d51bf9b545a/48804692525.pdfIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_28203898ea9d423582fad308d0e04e1b.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_a344aedd83414c06bebdeba078e4e699.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db778794-fcf8-45c3-8ef5-6edd0d59b158/royal_naval_reserve_officers_service_records.pdfIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_dd4da14844c14bd7816218771a3ef765.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 5436 bytes
SHA-256: 3b4074e5691c2e0b03b1482e163a16b6e2c97134f8509606acc28b73b64e2fb7
font_01_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 11288 bytes
SHA-256: 159e0e47052d9e9423faad1c81a5668ae2bed3083c831eb7ec73491532301072

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