Malicious PDF — malware analysis report

Static analysis result for SHA-256 f068e4fb41fd3712…

MALICIOUS

PDF

73.5 KB Created: 2021-02-16 05:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 12bd8f7a78efd49ec42dd12ae8138d96 SHA-1: 9b4efd661a7d74a37073e610467be4bd568f4e78 SHA-256: f068e4fb41fd37126a3107399a79d050b8f328581c3ab702d0ee3ecad6c8ffcf
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm for SEO or malicious redirection. ClamAV detected this file as Pdf.Phishing.Trojan, and a critical heuristic identified a mass external PDF link farm. The presence of embedded URLs and the ML classifier output further support a malicious classification. The document body is heavily obfuscated and unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/123?utm_term=ryobi+bc30+fuel+line PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469116/normal_5fce9c136cfef.pdfIn PDF document text
    • https://jotigigej.weebly.com/uploads/1/3/0/7/130739509/dalofixavazun_risotev.pdfIn PDF document text
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/c14c2c.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/zawijo.pdfIn PDF document text
    • http://hamsterbig.com/48313382170t5kgy.pdfIn PDF document text
    • http://zifasito.22web.org/jemejajopuvegotogivigemov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448535/normal_5fcf00c32eeeb.pdfIn PDF document text
    • http://goldstein.berlin/sentinel_prime_transformers_33rnux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5fd159cb2d6a6.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/jezekemunidup/bul_bul_kannada_movie_song.pdfIn PDF document text
    • http://fevufubot.rf.gd/how_to_connect_bose_bluetooth_headphones_to_lg_smart_tv.pdfIn PDF document text
    • http://mupefapakag.rf.gd/bicycle_card_games_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/21276650120.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/aplikasi_auto_tap_untuk_android_tanpa_root.pdfIn PDF document text
    • http://dexifuv.epizy.com/11327869149.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/honey_bee_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/24352400925.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_off0000d39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39A 4748 bytes
SHA-256: 0561c46ef787128ec670b289a94053403a24fe1c449d69606fad305918c5d7fa
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 11376 bytes
SHA-256: f5fa7ddbada19e943476e7a374f4f68602a43f736ef9b6379181ca703e5710dd
font_02_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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