Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b64cb65ff19aeca…

MALICIOUS

PDF

74.4 KB Created: 2020-12-25 23:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7a4d22a432bdf13b5c1efb7bd9536e2b SHA-1: e05579b19852f6f36fb8b5da37ab8c95f4c7d49f SHA-256: 5b64cb65ff19aeca3ef61e8bd3489fca7b3a8ee6193ea3a32072c5f7077d7189
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The primary URL, 'https://trafficel.ru/aws?utm_term=free+christmas+flyer+templates+for+word', suggests a lure related to free templates. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=free+christmas+flyer+templates+for+word PDF link annotation
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/renosileg-filopojalum-gupokupazaj.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/2277293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408460/normal_5fc4b5e942792.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/mizeteb/kabotamorokomez.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/wotimojelewasuguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f124bff-2f56-4969-a884-f100a7bc767e/wazori.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/brc_internal_audit_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/blank_venn_diagram_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/antivirus_for_windows_7_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/sutemagorefaxodobimukuxuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/1577410085.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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 5544 bytes
SHA-256: 0d90ac7b5dc4be096bf74dc3e94bff97003d6d52c3f0e608915fa26cffea87cd
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 10484 bytes
SHA-256: be083ad5b4e24d2fbafed263315c20c19f6ffad47cb7faf5996b11a5d8d9530b