Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4da0d483975cca2…

MALICIOUS

PDF

82.2 KB Created: 2021-06-13 11:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e0241c7daf88a1ee1770105d0ced18c1 SHA-1: ad7b5b48056f84bcc925db184510f163e060731d SHA-256: c4da0d483975cca20584015d14c5defac6506802410e1794835cf123a28fbf01
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 prominent URL, 'https://drafthe.ru/pbw?utm_term=ash+and+serena+amourshipping+lemon', being identified as a potential link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host multiple links on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/pbw?utm_term=ash+and+serena+amourshipping+lemon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463533/normal_60561051a981d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_6047f840a1000.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://zowonixepor.pbworks.com/w/file/fetch/144439794/how_to_assemble_diaper_genie_elite.pdfIn PDF document text
    • http://mujiwareneje.pbworks.com/f/79131794465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4472fec0-25dd-4815-b472-a52e52405143/great_penny_stocks_to_invest_in_2020_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8a27b0-ab62-4599-b1be-fb8b9c08beca/3012548030.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/w/file/fetch/144544155/baldis_basics_sonic_mod_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ab6771-ba6b-44ba-9024-ad1680b84e8c/dasim.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144411777/47376273231.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144422814/543861619.pdfIn PDF document text
    • http://wurogakitibe.pbworks.com/f/gerevoxalenasovulariki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e9c6bd-c84d-4a3e-bb8c-5a1c82128678/67793022085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98136932-9bae-4776-9f5b-3bda935cbcaa/koxutizetefotigafal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4957a45a-e670-4c37-be49-af55f82bcb76/introduction_to_machine_learning_with_python_andreas_muller.pdfIn PDF document text
    • http://xuzokufo.pbworks.com/f/nonazepifujivuwoverugux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a880f361-7d6f-4ac0-8f5a-9ab615ee3eeb/95283561201.pdfIn PDF document text
    • http://fixiguru.pbworks.com/w/file/fetch/144436497/95241803234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62d2b9a-e281-4d15-955c-64d825feaef2/flowchart_in_word_or_excel.pdfIn PDF document text
    • http://zikulade.pbworks.com/w/file/fetch/145144557/amharic_psychology_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4f28de-a4e2-4ea8-a101-8a827311f818/81587627442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f6b0dd-39f1-4520-b3e3-0da15b2f5bb7/89747454399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1a2e23-2342-4883-8bc0-b7a33d288994/sub_zero_model_642_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6c7b41-ba3c-4dc2-8429-db1d62ec2f87/fafokilamag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 5164 bytes
SHA-256: 1bba9da9bc6a36586ff8edf546063480869f3a032265614314c043fab9f61295
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 11672 bytes
SHA-256: 4487d8700de3bb0dc0d8460ea3d04d279b020050a94191e41b8e20e9b105d706
font_02_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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