Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f0287733ab5326…

MALICIOUS

PDF

77.6 KB Created: 2021-02-20 22:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aa23f4d9569b1479dd5840cab3ffb660 SHA-1: 957b57d2c0d98754adde2e9115324c955e11270a SHA-256: c3f0287733ab5326f30e39188ba81b1aaedaf6951c3eea2daa231ae089586f29
244 Risk Score

Malware Insights

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

The PDF was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a high-confidence ML classification. The document contains a large number of embedded URLs, suggesting a link farm or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=mr+coffee+12+cup+coffee+maker+replacement+parts In PDF document text
    • http://buylettersonline.com/99753599228nm42q.pdfIn PDF document text
    • http://choosenews.space/toyota_precision_sewing_machine_manualq1ea3.pdfIn PDF document text
    • https://winakafefumo.weebly.com/uploads/1/3/1/3/131397983/sikedudidoboriz-kurom.pdfIn PDF document text
    • http://pink-echo.club/childrens_hunter_welly_socks_size_guidef57j5.pdfIn PDF document text
    • http://abreudesigns.com/50314950605zvael.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/2339905.pdfIn PDF document text
    • https://mivagori.weebly.com/uploads/1/3/5/3/135318233/notono.pdfIn PDF document text
    • https://bamewubi.weebly.com/uploads/1/3/2/3/132303354/9808169.pdfIn PDF document text
    • http://smartcreditcheck.info/aba_english_apk_premium_20199risr.pdfIn PDF document text
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/rugaxe.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/fadebagepipafudefi.pdfIn PDF document text
    • http://13millions-warzone.store/630733704133iwgi.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
    • http://xonezerimagu.rf.gd/punjabi_mashup_bass_boosted.pdfIn PDF document text
    • http://paruwegugu.rf.gd/figurative_language_worksheet_1_answer_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 5248 bytes
SHA-256: 00e957a020f362c1d76b7a972686b64e16e5a46acd8393dd2d83ca064c58d911
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 10564 bytes
SHA-256: 4e2b724af5642eb47a84d91d0bc38369aa471187c4c7000a26c655ed03e7fdcf
font_02_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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