Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeac775a6d3ec45c…

MALICIOUS

PDF

75.2 KB Created: 2021-01-01 09:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b531e3c1de12cebcc9cc7f0e61818cf5 SHA-1: 2a081258c74d2978f88f1b89d7baf776d38574a1 SHA-256: aeac775a6d3ec45ce81aa7e74b5c9a7f06cb5626369c7dfd414ff7014d813632
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains like traffking.ru and cdn.sqhk.co, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffking.ru/strik?utm_term=fall+semester+2020+start+date+usa PDF link annotation
    • https://cdn.sqhk.co/zutujodara/jcjfmgg/bikes_drag_race_3d_motorcycle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_5fbf52982d772.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/rjnuyjh/ftdna_upload_myheritage.pdfIn PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/sepukowa_muzuzema_jamedanoveg_jonol.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/CRhjl0e/53286509998.pdfIn PDF document text
    • https://gunesuzupe.weebly.com/uploads/1/3/4/6/134679160/goxugetizix-xupebiw.pdfIn PDF document text
    • https://nagopajasire.weebly.com/uploads/1/3/4/3/134311949/e9987da4.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/bugojenozekulep.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/lososimap/90194852809.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/arkoma_basin_formations.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/template_windows_10_vmware.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/82672307473.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_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 4820 bytes
SHA-256: 4f3f80042329e515d1355e8f80108adc2283ea1d8da27352fe0816f674b5a284
font_01_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 10600 bytes
SHA-256: 6cc5947376f982b120cc5ad9a0b0b56b8291f5c30941028e3e12835134bcf64b
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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