Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5cbd9abd368fbb…

MALICIOUS

PDF

80.4 KB Created: 2021-05-20 18:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 53168e5d355d315727f7ac1a40f814c0 SHA-1: 833561e6d853b71cbb739f5a0647f28f7a317468 SHA-256: 8c5cbd9abd368fbbc33ace800d4d453c8bcfc03471618e663cdeadbc5921df65
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-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.
  • 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/strik?utm_term=how+to+print+avery+8160+labels+from+pdf In PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/xonedarosuzaw.pdfIn PDF document text
    • https://rinilevewabidu.weebly.com/uploads/1/3/1/3/131382630/1f9ba71f.pdfIn PDF document text
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/fawutabukere.pdfIn PDF document text
    • https://sejubapis.weebly.com/uploads/1/3/4/8/134887951/a09098.pdfIn PDF document text
    • https://megogolu.weebly.com/uploads/1/3/4/3/134314378/918262cab5a0b.pdfIn PDF document text
    • https://fobulosarurek.weebly.com/uploads/1/3/3/9/133997379/tegutikim_wibabolo_wibogaki_xaxodel.pdfIn PDF document text
    • https://tivuzukabatabab.weebly.com/uploads/1/3/1/4/131405927/2310566.pdfIn PDF document text
    • https://gimebupezepufo.weebly.com/uploads/1/3/4/5/134507041/dodovi_laxalafevagobef_geduzemexazux.pdfIn PDF document text
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/2600108.pdfIn PDF document text
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/9681565.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
    • https://s3.amazonaws.com/toliwudalamem/94794822750.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/lowizemukomizezakuse.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/cycloramic_app_iphone_5s_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/guided_access_apple_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/welusobadisib.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/riziran.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/10021748398.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/zobulejatezarotof.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/vampire_diaries_season_1_soundtrack_download.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/26404534592.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_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 5872 bytes
SHA-256: 5ae03e3bf40c41a212d4328bf3a27ae8d9e55ab2978a5e43b18d33c345947a4d
font_01_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 10880 bytes
SHA-256: b6a9fa4b7c6b619a7477ca1604f1b401ddbfd2925b41813c5a13d02fbbd935fe
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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