Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ed9eb4a09d9a6e…

MALICIOUS

PDF

77.5 KB Created: 2021-01-12 01:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2c7d0c4be55507b1c9ff56483cc79b00 SHA-1: 3418a606ab14950b8f7a7d139cdf907f95ba0ee2 SHA-256: b4ed9eb4a09d9a6efe51f5e0ad0996a698eaff865403c206a012bcad15eeb8d1
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector. Another heuristic indicates a PDF link farm, suggesting an attempt to distribute or host malicious content. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://traffmen.ru/aws?utm_term=black+desert+mobile+jp+apkpure In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366653/normal_5ff58b41ccc2d.pdfIn PDF document text
    • https://site-1168140.mozfiles.com/files/1168140/resident_evil_3_nemesis_ps1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474191/normal_5ffb907bd1664.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/buvoxeneb.pdfIn PDF document text
    • https://site-1179199.mozfiles.com/files/1179199/janikilirawabe.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/juzinaramip/affidavit_template_queensland_magistrates_court.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/unicorn_adblocker_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/wow_engineering_guide_gnomish_or_goblin.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/fipubejafisitavalit.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/74224354168.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/kingdom_hearts_birth_by_sleep_commands_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/varukinitakedun.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 3700 bytes
SHA-256: dec137e70df5f340c1e0c561c011f17479677fab4c6902f7e974f60ae21bf50c
font_01_sfnt_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 5548 bytes
SHA-256: 24fe1a2042134fdd802d1392fdf50ab0f84c3e3ec644fa72796b300f165cc934
font_02_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 12676 bytes
SHA-256: 8b22a437e5d422e07544b7f1bca8dbe2756fc34a99b72010672a73918193b242
font_03_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 16092 bytes
SHA-256: 1733294cd4efe6eb5a1c38b033a3da0bd69f43be3259469e0667c8323d1c848a

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