Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a05ace15e25efe2…

MALICIOUS

PDF

76.8 KB Created: 2021-03-31 05:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac302330caf1f805b6cb983f158e134b SHA-1: aeef5e4676f3c0d1d33f23689619184003a4d427 SHA-256: 8a05ace15e25efe2ee32a004a9e2e8e89d599832b6d85cdcca95a123c28f8d00
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with one URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links suggest it is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://botokaw.ru/award?keyword=business+strategy+template+pdf PDF link annotation
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/pdf_tambaoga_mwanangus734q.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/ziguxifexuvuxasugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445736/normal_6016a6550be3e.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/fimuxeg.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/a379144960.pdfIn PDF document text
    • https://zejizatuziw.weebly.com/uploads/1/3/0/7/130739720/406989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_601d0196c3ccc.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/a263e2ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_600ad75a29990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fd356471d586.pdfIn PDF document text
    • http://design-kvartira.info/xagesejimosokewawocv2ht.pdfIn PDF document text
    • http://edarudost.online/innovative_strategies_in_teaching_sciencew7lbl.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/c6a14b63-212a-45b5-a945-bf1c6b597bfc/jiwipaverurob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee6e911-de05-4fb5-8615-4ebf4d909eee/microsoft_excel_shortcut_keys_free_download.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_8f4be516588b44d787e8d7633996d250.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_39a6c56d16b34db1a479d71ce120b629.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_d03fc978d2164ccbb3bb0128066cac48.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_19b70ebd772e4a43a2c90e287c209935.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_fa61b10211e048508fd43af0b7097977.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_e56c0bf5062740f9b9131ec108665ff6.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_d27b749473344bc0a8183a4d717db517.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_60caeeee5a464c3985154df1380b57c2.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_3caf409855c6453bb5b8286efab6d14c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd60dcfa-2c08-4ad9-820f-3693e8217504/movies_like_history_of_the_world_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f3eaca-d01d-44ff-85dc-9691c83219b3/iso_31000_risk_management_ppt.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_fd6511166bd640979c4558d880716826.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_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 5512 bytes
SHA-256: b7b5b905222c093e3c4dfefc26a852c237eb219114d1fa8b48ec266784491b37
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 10396 bytes
SHA-256: 2da65d96478e0d86ad7aa48fa2e5deb56ffcbf38a64285608a364b19105ba0d2

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