Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd6b9a9f8449ef8…

MALICIOUS

PDF

123.8 KB Created: 2021-02-22 05:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9a4e5d01e586f7bfe3c585c92eeb4302 SHA-1: 711637b4f54ee43dddd91be9c6e6a70af1f47596 SHA-256: ccd6b9a9f8449ef833c8ed75c52dafa3c416222ec9ab859e26f227c33759c641
244 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing attempt. One critical heuristic indicates links to known malicious redirector infrastructure, further supporting a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=series+llc+operating+agreement+template In PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/judofap_fogar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476140/normal_60023e422d8f5.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/baofeng_uv_5r_rtp_manualn7qea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457838/normal_600310ba01ccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_60146b6053556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_601b748badf52.pdfIn PDF document text
    • http://kawlites.online/gotevolibukitiroy0p3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_602e00e9acb5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_601e7221839c4.pdfIn PDF document text
    • http://sufevar.22web.org/zusov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483359/normal_6004900e7d5d4.pdfIn PDF document text
    • http://itash.space/voluntary_acknowledgment_of_paternity_form_texasj59ix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_601967e15131c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_601e93e53f436.pdfIn PDF document text
    • http://hamsterbig.com/switch_audio_converter_free_apktpnra.pdfIn PDF document text
    • http://insta-sale.site/dodowabix2vawg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibibojusajol.rf.gd/kuxezipebif.pdfIn PDF document text
    • http://kajopulijus.epizy.com/annamalai_tamil_movie_songs_free_starmusiq.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_off0001a568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A568 5356 bytes
SHA-256: 54c5b492e27f9903f094e6bc23f3cc38026d5bbbf7cc436ab0b44a75a161e957
font_01_sfnt_off0001b78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B78B 12096 bytes
SHA-256: 85b6fa29c02cc91748463fa258520181e6f3b69fec539e4adf410870bd05880c

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