Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9d2e54af701862…

MALICIOUS

PDF

80.2 KB Created: 2021-04-30 00:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a1eca0f0b81b69b7b0e89f968961fec7 SHA-1: 25dda37a518339a7d41d04ded7406e1592a15cc8 SHA-256: 7c9d2e54af701862c84f9113f80ed9726c8f9ff7f87effa7d3d925d04797f16f
244 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically targeting search terms related to TV troubleshooting. The heuristic firings indicate the PDF is a malicious redirector and part of a link farm hosted on disposable infrastructure. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest an attempt to phish or deliver malware via a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=my+samsung+tv+has+no+picture+but+sound In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_603f4d8b6e84d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_602448af423d2.pdfIn PDF document text
    • https://webimilosajepi.weebly.com/uploads/1/3/4/8/134859137/fewexatopiwaz.pdfIn PDF document text
    • https://xewaxegixu.weebly.com/uploads/1/3/0/7/130739020/rixuzajefubunefeg.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/all_creatures_great_and_small_summary.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/sosibumaxoxekubidoro.pdfIn PDF document text
    • https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/609dea436.pdfIn PDF document text
    • https://lexaxaverewazud.weebly.com/uploads/1/3/1/3/131381910/bomexefumijuviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_60624b66864ac.pdfIn PDF document text
    • http://vegoletox.medianewsonline.com/pdf_catequesis_primera_comunion.pdfIn PDF document text
    • https://povebosi.weebly.com/uploads/1/3/5/3/135346093/355475c.pdfIn PDF document text
    • https://sajabewegapin.weebly.com/uploads/1/3/4/5/134592402/doguxamopokusolut.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://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_67458d019d7b4fd88d42012ea212541b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26ca0a4-185e-47d0-8d4f-233f1d0eeff7/imagenes_de_caritas_tristes_y_alegres_para_colorear.pdfIn PDF document text
    • http://wurebosuloxu.myartsonline.com/sedisenopalifa.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_5cf203819f094d5cbb409a548e2e4f26.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_544bee9c09524c869f903b0f34d21fae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54dd3f1-29a1-4c18-b7f0-4fe8c9a0cece/89020386868.pdfIn PDF document text
    • http://suruliloxapesas.myartsonline.com/35333282744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98472818-fa42-4c78-86e7-e2887b195642/kokoro_yoga_brightwater.pdfIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_ad18a5fc23bb4cbb813012467e11e2d6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 5644 bytes
SHA-256: fc3972a02ba5187f59a8132036c38fdfe48975776002cd2673256896b403bc68
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 10416 bytes
SHA-256: 1f0048c6391fee8a70f3344f46bd01aded1c47fd2a66265d2e656ac45b97a913
font_02_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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