Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a8ab880e0d7b85…

MALICIOUS

PDF

75.7 KB Created: 2021-02-25 23:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8604b3e72daf03d9a9aee71c4a6ced37 SHA-1: 9338b5f4f5d4bb04f0bb4b29e8d7fa986b05b170 SHA-256: c8a8ab880e0d7b85d6068c1c7b014b91b4a9aa49ebe7ed9119bbec64d32f344b
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=what+does+red+light+mean+on+zmodo+camera In PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/b95fc34f2b9.pdfIn PDF document text
    • http://naturfresh.fun/39064012929c1edc.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/1b087657496cf.pdfIn PDF document text
    • http://file-id.ru/latin_book_2qoaux.pdfIn PDF document text
    • http://indital.space/busujaxaravimefevubesulg5bsp.pdfIn PDF document text
    • https://wikagigodoxuf.weebly.com/uploads/1/3/2/8/132814929/gujin_gixidamesa_dasasujegerud.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/how_to_use_omron_intellisense_wrist_blood_pressure_monitor.pdfIn PDF document text
    • http://mastera-saydinga.ru/17318890677uil4e.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/7979148.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/podivobogo_bibikuta.pdfIn PDF document text
    • http://vvinorama.website/kansas_city_hornpipe_bagpipe_sheet_musiccstoq.pdfIn PDF document text
    • https://digeforoxega.weebly.com/uploads/1/3/4/6/134668277/rogigafiso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/centrale_lille_formation_continue.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/80702679377.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/hotstar_vip_new_app.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/96006048669.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/android_vs_ios_2018.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_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 5416 bytes
SHA-256: 72347d8ca2199c31b4c2187575baa74cbb744328e29e395bb04475500756c185
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10540 bytes
SHA-256: 9fa0b7a2f4b9a6dc44458eac782dc7245483bea8dc874b44bd0ccc3199b8a2c2

Open this report in the interactive analyzer, or submit your own file for analysis.