Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ed59bea313ef28…

MALICIOUS

PDF

107.0 KB Created: 2021-03-29 23:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6fe417d5210d76e93e8e089429b5a717 SHA-1: bce3b2bc2cc87b3830deb7f1e0d14b8769fb674f SHA-256: 14ed59bea313ef288771173ba52cb3ff991c88294958aa6599576bb0aaddf0a6
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services like weebly.com and sqhk.co, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/123?utm_term=answer+key+mpsc+pre+exam+2018 PDF link annotation
    • https://cdn.sqhk.co/pigajifaw/z1qNii5/jolefumejemikikidura.pdfIn PDF document text
    • https://mafekesajivirik.weebly.com/uploads/1/3/4/3/134381466/bufiti-komexir-wuniravemi-wigifakitomef.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/FPihEid/brochure_templates_online_free.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/fimuroxo.pdfIn PDF document text
    • https://zuxusesomopekem.weebly.com/uploads/1/3/5/3/135305840/8064145.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/786abf0ad9.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/heWXBG2/exploration_definition_and_pronunciation_of_apocryphal.pdfIn PDF document text
    • https://jobikituloxexe.weebly.com/uploads/1/3/4/4/134456837/doduzodagemipomenod.pdfIn PDF document text
    • https://katidifivova.weebly.com/uploads/1/3/4/7/134715674/rolofiwuv-naragopumajano.pdfIn PDF document text
    • https://muvitaburire.weebly.com/uploads/1/3/4/4/134441723/1474821.pdfIn PDF document text
    • https://cdn.sqhk.co/poxedomeke/dhbBhgN/51361621405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_2c98212c673040ed8691deded96ef1c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/79894290933.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/wanorijonaxebofekolefo.pdfIn PDF document text
    • http://defefefesid.rf.gd/american_english_file_starter_download.pdfIn PDF document text
    • http://gorevifero.epizy.com/91403259899.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/crochet_cap_video.pdfIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_3caf04204e1e447cbe00a03be79ef54a.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_af298e50a4fe4ffd97dbf51b7311f1bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/zubonejonidud.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 5884 bytes
SHA-256: ecd021a6605e677ce8cb1a074d97f3d6e0e51697540e663f4d0a065528e44423
font_01_sfnt_off0001406e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406E 12356 bytes
SHA-256: e37314336944a768dc65b2b6b9380ec23cc7a8d6a77d58114fd97ff209a3b9d9
font_02_sfnt_off00016acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACC 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00018035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18035 8416 bytes
SHA-256: 9857f958cd0e270de4912fd19b766085c980464e2dcd99f0c40b9f34c9316099

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