Malicious PDF — malware analysis report

Static analysis result for SHA-256 7543edbc2db788ac…

MALICIOUS

PDF

86.3 KB Created: 2021-04-08 01:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e2946c8fb77a422603ab88e56544aa1 SHA-1: e7a8eb9903cc78a057928230a3daad93cb595a92 SHA-256: 7543edbc2db788ac2f7e7566a9a1da79a6b5fe892bbb2e3bf26a85ce8312514b
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, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to 'spektrum transmitters', likely intended to trick users into visiting these linked sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=what+receivers+are+compatible+with+spektrum+transmitters
    • http://copyrighytsupport.com/54598505813ko0zf.pdf
    • https://bodosimif.weebly.com/uploads/1/3/3/9/133999894/wejekenijulaja_surotizonak.pdf
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/resopesad-torawu-towanivasofaxoj-novirazobegobi.pdf
    • http://sarhello.online/temopuwuxaxogu64nl7.pdf
    • http://nonretloli.site/basic_computer_science_online_course_harvard4v3jo.pdf
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/regameg.pdf
    • http://raftgjgr.space/42141933066qti6o.pdf
    • http://navavij.22web.org/appdynamics_4._4_documentation.pdf
    • http://fly-drive.online/best_free_antivirus_for_android_phonescl5hi.pdf
    • http://bestgirl69.com/xirubememokilirustnope.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mevidow.epizy.com/non_veg_dishes_in_tamil_nadu.pdf
    • https://uploads.strikinglycdn.com/files/9da872f5-71f3-41c7-91e3-7e42b84fe6eb/95884555984.pdf
    • https://uploads.strikinglycdn.com/files/ad44bcaf-a5fc-49ed-9680-d41a82025b5a/vewozenujusaz.pdf
    • https://uploads.strikinglycdn.com/files/72fcdcb6-a5f0-4e13-b120-31c9cb54540b/dibolowot.pdf
    • http://nasakitubaribud.rf.gd/good_morning_photo_shayari_hd.pdf
    • https://uploads.strikinglycdn.com/files/19bb3031-af37-463b-bcf1-b4e9124914e5/34764531295.pdf
    • https://uploads.strikinglycdn.com/files/218e3c4f-1afa-4f6e-aaaa-10a91323860d/spoken_english_grammar_syllabus.pdf
    • https://uploads.strikinglycdn.com/files/8415cde6-535b-4132-928b-9fe9263df1f9/34023891121.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_off00011101.bin
84c4b08b03a277ba78f83a9183f7200c413a00d4b4e012983cf647c400395a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 5544 bytes
font_01_sfnt_off000123c5.bin
3ca4f83176e9e7344888da0b5ab1759d63ae892950fe05c8dea69083ead51145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 11428 bytes

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