Malicious PDF — malware analysis report

Static analysis result for SHA-256 015828cde74303ba…

MALICIOUS

PDF

79.4 KB Created: 2021-02-28 12:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7d89be6b2d8f9f14de5ac1e5e193a5c8 SHA-1: 76212c75ab5372ca7ddb6c6b6b03fbc66f7af4a8 SHA-256: 015828cde74303ba6ebbc2b76c9d1bd046147a9a220981c2cca311bae111e5a9
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to external PDF files hosted on a variety of disposable domains, indicating a link farm or distribution mechanism. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • 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/award?keyword=cat+eye+velo+5+not+working In PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/4487324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_600bb9cfc3764.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/c1pjaha/find_my_phone_iphone_11.pdfIn PDF document text
    • https://dapofawebowo.weebly.com/uploads/1/3/5/3/135347186/judozavod.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/53248667555.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/pjg9Xgh/64096419674.pdfIn PDF document text
    • https://cdn.sqhk.co/sawusuzi/IH79ngg/sejolafitixove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427781/normal_6001daab0acc7.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/cijicgh/19520775820.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/6.0_powerstroke_ficm_repair_kit.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/english_composition_online_course_free.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/95171729499.pdfIn PDF document text
    • https://mesikanuxiruk.weebly.com/uploads/1/3/1/6/131636832/xelexakoruf.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/is_the_book_divergent_appropriate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 5024 bytes
SHA-256: d57b844e2cae00246a3971abf88725ea31396d0cf8a718d8ef8fc77594d6db84
font_01_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 10412 bytes
SHA-256: 1a46b3d11b80b8b70c2f7088b996971ceeb05322485c4fbb4e805b90f76ed7c7

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