Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb7691ee4860c3b…

MALICIOUS

PDF

72.5 KB Created: 2021-03-30 12:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c8b77f2b220f7c8337f272fce90dcb3 SHA-1: e1b805e597f3c85ba4ff9125be0919001def1427 SHA-256: bcb7691ee4860c3b5a09d52dfef13d235d234fbe94bce4cf17fbd8f4df75b53f
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary URL, 'https://seumenha.ru/wix?keyword=biblia+thompson+pdf+romana', indicates a lure related to a specific PDF search. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://seumenha.ru/wix?keyword=biblia+thompson+pdf+romana
    • https://cdn.sqhk.co/dodamewope/ia3jhXf/shark_attack_hawaii_2019.pdf
    • https://pexarokozisakim.weebly.com/uploads/1/3/5/3/135313666/4469472.pdf
    • http://wedidizelajat.mypressonline.com/kuwebumajakazop.pdf
    • http://potuduwatolebu.mywebcommunity.org/mudirajaxatu.pdf
    • http://desokore.medianewsonline.com/69487559124.pdf
    • http://gepokupaburorew.mywebcommunity.org/calendar_september_october_2020.pdf
    • https://xamirudanigux.weebly.com/uploads/1/3/0/9/130969419/4992566.pdf
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/9632664.pdf
    • http://kovafuwir.getenjoyment.net/haldol_decanoate_package_insert.pdf
    • https://jokokosewel.weebly.com/uploads/1/3/1/4/131437237/vixurogiwun-rabutativirin-pilobojemusut-xodijof.pdf
    • https://cdn.sqhk.co/ninuxoti/GNAichc/24639081014.pdf
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdf
    • https://cdn.sqhk.co/toromerepowa/eji4Yob/walmart_black_friday_2020_ads_online.pdf
    • http://dokojekiferej.mygamesonline.org/moulting_in_insects.pdf
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/wewuwogilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2b4b9a66-705d-4e40-a31d-28d4db190467.filesusr.com/ugd/1dbb98_61b862f6fddb4fee8da3f1f1a28cebaa.pdf?index=true
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_b4b57960922449b8b8d9f70a791780cd.pdf?index=true
    • https://s3.amazonaws.com/gurafoga/aahatein_agnee_band_songs_free.pdf
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_59db76b801654d1b8b7f98ab3f5a031c.pdf?index=true
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_9a0fe52a55454720b4e924f974b84921.pdf?index=true
    • https://s3.amazonaws.com/benuka/59123893066.pdf
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_02046cb24ba54dc985a56a4bf5b8a6c6.pdf?index=true
    • http://xowilewegiwo.myartsonline.com/singer_golden_touch_and_sew_750_bobbin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4a.bin
61cec388fc3e2680a66f1759cc23cd07ab0522f7af5960947dd3d3810be6ac24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 5472 bytes
font_01_sfnt_off0000edae.bin
7735c5603108377926a77600ca3aca215c33f3604fdc8d4a7bfc88adb1f06eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 11372 bytes

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