Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed100f98bfc5c12…

MALICIOUS

PDF

71.9 KB Created: 2021-02-27 03:04:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 537d93445d6cffe1a1e680a0f6cf7880 SHA-1: afa6c225de3ad7bf2c504f9c92c81053e952c141 SHA-256: 3ed100f98bfc5c1271730a354a9b06d6f038882a20926ec18f761e4aecbb7fed
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The embedded content, though heavily obfuscated, appears to be part of a lure, possibly related to search engine optimization (SEO) spam or phishing, directing users to various external websites. The presence of numerous links on disposable hosting further supports a malicious intent to drive traffic to potentially harmful sites.

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/wb?keyword=troy%20bilt%20190cc%20lawn%20mower%20oil%20capacity In PDF document text
    • https://kogozodibivuf.weebly.com/uploads/1/3/6/0/136094397/jawijapuselo.pdfIn PDF document text
    • https://dejatenuti.weebly.com/uploads/1/3/5/3/135348415/toluwaf-kazibapuzar-pikomesor-zutikov.pdfIn PDF document text
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/7698491.pdfIn PDF document text
    • https://tolazekujulom.weebly.com/uploads/1/3/4/6/134668849/wumopolaresurofo.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/xedupap.pdfIn PDF document text
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/nowezepireko_bipaginipofoge.pdfIn PDF document text
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/newina_zinimeputunili_sagora.pdfIn PDF document text
    • https://tipuvativojodud.weebly.com/uploads/1/3/4/7/134754547/6258374.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/1174640.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/cihdjbI/prime_video_android_tv_tcl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumopigaw.epizy.com/heat_of_combustion_of_alcohols_lab_report.pdfIn PDF document text
    • http://tivapatovike.epizy.com/dreamboxedit_3._0_0._0.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/shark_-_ion_robot_app-controlled_robot_vacuum.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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 5536 bytes
SHA-256: 6838068c500ac6324f28bbf4ca9c6307e3fad5e851f116983cc779f598bd4dd4
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10292 bytes
SHA-256: 5158e2830ae3fd41c2a76ec78063b29b74dcc6e660828e026d5f56e4db3f11f6

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