Malicious PDF — malware analysis report

Static analysis result for SHA-256 57457b3bb2f72762…

MALICIOUS

PDF

76.8 KB Created: 2021-06-12 23:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 081f317a74e5a0f90d5d93b8fc3f2372 SHA-1: bb5e3393f9fa95948c0082af6ccaf5a82d40d9ce SHA-256: 57457b3bb2f7276266d6f051ebd4d44c389071e153fbcbe9c4c8b3d4a9bd867f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm. The primary URL observed is https://allytemp.ru/pbw?utm_term=vantablack+hex+code, which likely serves as a gateway to further malicious content or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/pbw?utm_term=vantablack+hex+code PDF link annotation
    • https://voximaka.weebly.com/uploads/1/3/4/0/134017552/9552027.pdfIn PDF document text
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/nosega_xamukamusifivo_derure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5fe583f5162ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464724/normal_5fcb2c772c6a4.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/junobezasa_gupubafav_tigifiramoreras_lotejebuliw.pdfIn PDF document text
    • https://rerijore.weebly.com/uploads/1/3/1/8/131856643/aae8a0.pdfIn PDF document text
    • https://falumegobe.weebly.com/uploads/1/3/4/7/134702986/285128.pdfIn PDF document text
    • https://bikafosujikus.weebly.com/uploads/1/3/2/8/132815014/sonafotezixurujasuke.pdfIn PDF document text
    • https://fizolapojola.weebly.com/uploads/1/3/1/3/131383549/a5a83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lexibitite.pbworks.com/w/file/fetch/144534378/2236961391.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/f/wepurofupaloxumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c74168b-80c7-494b-8df2-3d1c2cc500ac/the_purpose-driven_life_what_on_earth_am_i_here_for_booklet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909e8a02-1e09-4553-965a-0bd0488a9ff4/how_to_analyze_the_risk_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305ceab8-7956-4706-9622-f317e94f3338/anne_catherine_emmerich_movie.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144710757/e_flat_alto_saxophone_finger_chart.pdfIn PDF document text
    • http://bikopatepo.pbworks.com/f/11728733863.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/145073163/55266366784.pdfIn PDF document text
    • http://ginosofep.pbworks.com/w/file/fetch/144790170/valipurofekikofiturapuzap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185a1abc-0929-4a41-90c9-0aec0c75129d/is_allegiant_air_giving_refunds.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 4992 bytes
SHA-256: fa8fdd9afe62eba7d3e8b0209d91ea020cc36de7d17bcf9b705221316e502018
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 12112 bytes
SHA-256: ad12f55e18a8553139edad530f80995cabab0571494b0fe4a0b748f626df4045

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