Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19a5a8faafd1d5d…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 08:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aca313ed97eeca5fc7ca17121009073a SHA-1: 752b5936b60a91be05929b9e5fec30a2177ffab8 SHA-256: a19a5a8faafd1d5d8c5b1dc97761050d78d56c596f7f7485409f172075605d1a
164 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/wix?keyword=csi+algebra+kareem+al+jabr+answers
    • https://cdn.sqhk.co/lenubire/WxyvIge/lologuroxexusaxute.pdf
    • https://cdn.sqhk.co/wekaradukuve/ejfHhh4/human_fall_flat_ps4_download_size.pdf
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/6548449.pdf
    • https://cdn.sqhk.co/seworani/viaOsij/88502034740.pdf
    • https://jesomufufasak.weebly.com/uploads/1/3/1/8/131872286/0eb567196.pdf
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/fagedojurupim.pdf
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/8763644.pdf
    • https://cdn.sqhk.co/wujakegu/ijigeHP/make_a_unique_list_in_java.pdf
    • http://vijexibat.mywebcommunity.org/how_many_projections_in_engineering_drawing.pdf
    • https://cdn.sqhk.co/dodalowogiv/gjzhijg/spades_rules_nil_scoring.pdf
    • https://cdn.sqhk.co/vivepovugeli/gjhw3jf/31610635187.pdf
    • https://cdn.sqhk.co/nejijilo/nySggpm/wavudabekopogigim.pdf
    • https://cdn.sqhk.co/gusisitixinu/g1Nhhia/vilezaduzafowonitomiwoj.pdf
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/fapagefinukuvademana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xesidif.epizy.com/alphabet_exercise_worksheet.pdf
    • http://lozinirano.epizy.com/kodisavagus.pdf
    • http://jafepotafeno.epizy.com/contractions_worksheet_5_answers.pdf
    • http://bolapapuziku.epizy.com/addons_video_chrome.pdf
    • http://begalokatixatu.epizy.com/chaverpada_malayalam_full_movie.pdf
    • http://jomovexujufadi.epizy.com/65211951633.pdf
    • http://bavosezema.epizy.com/force_field_analysis_template_powerpoint_free.pdf
    • http://gozidonozali.myartsonline.com/xevaxe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f193.bin
60fc2b8fc142382b4153ffb081c37a120d9f473f3946721ad3a9718b15c4ff7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 5280 bytes
font_01_sfnt_off00010387.bin
717be974c02a949241f713d58c414ea875a2bbd4aa559cac2509dafb5d466d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 11188 bytes

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