Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5ec48eb5a3135d…

MALICIOUS

PDF

73.1 KB Created: 2021-03-17 01:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 486214e2f1694c8987b6661f488454f4 SHA-1: 0d783684928e47c977703184e3de2aaf9b73a5ca SHA-256: 8d5ec48eb5a3135d725acea1ca64d1625a17d78dcb6df2b66833de070111c3f5
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirect to malicious infrastructure, including a known malicious redirector. The document's apparent purpose is to act as a link farm, likely to distribute malware or facilitate phishing attacks. No scripts were extracted, but the presence of numerous malicious URLs and the ML classifier's high confidence score indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://dafemum.ru/wix?keyword=marlboro+township+paper+shredding In PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/1110298.pdfIn PDF document text
    • https://juvumumirogo.weebly.com/uploads/1/3/5/3/135313675/2a9592ead240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_601c8862c74f1.pdfIn PDF document text
    • http://studytogether.fun/where_is_the_car_seat_expiration_date9vz8u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5fcd666f4ffd9.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/wasowelixaboj.pdfIn PDF document text
    • https://garevanixuxud.weebly.com/uploads/1/3/4/3/134371644/xanop.pdfIn PDF document text
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/1590cdca6a1.pdfIn PDF document text
    • http://1xbet-registrat.site/touching_spirit_bear_chapter_questions_and_answers17g1s.pdfIn PDF document text
    • https://febufovita.weebly.com/uploads/1/3/4/3/134324671/9216168.pdfIn PDF document text
    • http://therarbooks.com/36425779438jd43t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_5fe4b94ec619d.pdfIn PDF document text
    • https://valexipeval.weebly.com/uploads/1/3/0/7/130775413/ca8ff0d5.pdfIn PDF document text
    • http://domavera.ru/150634834017v85d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445331/normal_5febc6c586464.pdfIn PDF document text
    • https://jeporifitev.weebly.com/uploads/1/3/4/2/134265357/4114209.pdfIn PDF document text
    • http://bosuxezaxad.mypressonline.com/afcat_syllabus_for_flying_branch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5ff427c060031.pdfIn PDF document text
    • http://totalcreditcheck.info/learn_how_to_code_with_scratchfb6vh.pdfIn PDF document text
    • https://tatedamemod.weebly.com/uploads/1/3/0/7/130739791/xejiram-kebagewanozim-pevikupowimavix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26482862-e682-401d-a13f-d5d2513f0f37/papefexemed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4804250-f23d-4ad7-b61d-9087239028e7/93717721622.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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 5460 bytes
SHA-256: 30eae48ddb74493066a752d758cd2039830ae1d36d33c3e0e7d10a304ec4c4c4
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 10604 bytes
SHA-256: 977e44d15d8759fdd38a37b14ddcbce93b86c2511ab58462a3477272e3cc5d58