Malicious PDF — malware analysis report

Static analysis result for SHA-256 887dbb62fdfb3455…

MALICIOUS

PDF

79.4 KB Created: 2021-03-24 23:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bf7a9f9eaecf8b2145e0a28fb64889c5 SHA-1: f65d7149c90e855c6431bb0210835da03f522ee5 SHA-256: 887dbb62fdfb345574a9cae4bbebc0665fe39bb4928d7fe0b27b51976883defc
226 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new payment instructions, a common phishing tactic. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://zajinet.ru/strik?utm_term=harry+potter+quiz+patronus+pottermore PDF link annotation
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/wulipani_sulunigi_figeka_fimifiwev.pdfIn PDF document text
    • https://bozuluxowefag.weebly.com/uploads/1/3/5/3/135349757/bezumogaruwe.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/13031849424.pdfIn PDF document text
    • https://welukixavise.weebly.com/uploads/1/3/1/0/131069839/1985443.pdfIn PDF document text
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/8993f.pdfIn PDF document text
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/b84649010f97.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/how_to_prepare_for_aapc_exam.pdfIn PDF document text
    • https://juzubuju.weebly.com/uploads/1/3/4/7/134703155/66c5b77f31e9f1.pdfIn PDF document text
    • https://fisujurij.weebly.com/uploads/1/3/1/4/131437504/poweviwefonetegi.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/pofulute.pdfIn PDF document text
    • https://boxotajisosuni.weebly.com/uploads/1/3/6/0/136086252/befopinumamopo-wugedamumu.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
    • https://s3.amazonaws.com/julaxel/sevaxixize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25633876-7445-4ec1-967d-a0f635f5e832/whirlpool_cabrio_platinum_dryer_check_vent_light_on.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/kemodagogoxinobavisudef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41db502f-61aa-47ce-9b78-f2cd3350edaf/15783158000.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/japuvapibibidu.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/65837284400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0751c939-5313-466d-b781-ae4fe1282382/94679351187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edc9c02-6e54-4729-a985-e4d79c173d76/myers_briggs_types_compatibility.pdfIn PDF document text
    • http://bememikat.onlinewebshop.net/human_resource_management_books_for_bba.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/84396046299.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_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 5052 bytes
SHA-256: 1f29ac40dfc06a98ac30d776f0b2b555fbc8a994f0ee9c915fdb677181a8495b
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 11276 bytes
SHA-256: ca6fa403fc7829748615242ec34147a7fddce1775008dcf15de1d9a0f4ecb277
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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