Malicious PDF — malware analysis report

Static analysis result for SHA-256 334ea7a152661110…

MALICIOUS

PDF

74.4 KB Created: 2021-03-09 11:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c9348d250925f2d84d561ea42ba94c0d SHA-1: d94204d9a12ceef316f1038fc3c4fb333c442302 SHA-256: 334ea7a1526611100f1a1ddda792a49e01aec08fac4b060518fb8807aeda859c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous external URIs and its classification as a 'link farm' suggests the document's primary purpose is to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate malicious redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=ch+play++cho+iphone PDF link annotation
    • https://cdn.sqhk.co/wujugojuse/cgegjiT/welaruganezim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_6016a6b75abe1.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxiteparam/7m4oE7d/domino_dash_unblocked.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/gopalolo.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/e8d93475f59e5.pdfIn PDF document text
    • https://dijozigi.weebly.com/uploads/1/3/4/7/134748041/noruramefakezewagozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_6035a31e78fcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478655/normal_5fcaa6ade49c8.pdfIn PDF document text
    • http://xupoluwifokolo.22web.org/notatakevero.pdfIn PDF document text
    • https://zikowetaxubof.weebly.com/uploads/1/3/4/0/134012945/pofugij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495393/normal_5fe0895be93fe.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/Yji9gfg/telemedicine_app_development.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvikavirilija.rf.gd/faxetetegekifinujud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfda6d4-deae-4c33-b3ba-28e827b68c94/timegubupolafewafemuz.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/acc_guidelines_for_anticoagulation_reversal.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/xetukiriribuwukivebi.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/o_positive_blood_group_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b1b07b-4505-4925-9e75-fb6e9bb0b3e7/rujuzorijazodagutosizigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe476c5-7251-4ee9-bfba-0785a7a49503/how_to_start_a_vegetable_garden_home_depot.pdfIn PDF document text
    • http://wewiligeva.epizy.com/logojexozura.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_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 4752 bytes
SHA-256: 6b63e513479a47be06b5d2599c16dbd7645898d76ead87c3e1b22010861af3df
font_01_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 11136 bytes
SHA-256: 91cc31004c09d5f817c7c9ce9e698de61401ec755d13b6a2c18035ea21f63016

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