Malicious PDF — malware analysis report

Static analysis result for SHA-256 d766b91217d89e3a…

MALICIOUS

PDF

78.0 KB Created: 2021-02-10 21:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d0a1b5245ded57ffef2147b586856938 SHA-1: 251facfeb2ea4c3e6b5870669929a3a74abcc1ab SHA-256: d766b91217d89e3a277462df593ac8a6d7fcae32d677a2b8e27c95bd1ef01101
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, indicating a link farm or SEO poisoning tactic. One of the primary external URIs, 'https://jacksth.ru/aws?utm_term=blank+periodic+table+of+elements+worksheet', suggests a lure related to educational content. ClamAV and ML classifiers strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=blank+periodic+table+of+elements+worksheet PDF link annotation
    • https://favujoki.weebly.com/uploads/1/3/5/3/135302790/7937549.pdfIn PDF document text
    • http://thepropheticapp.com/80321703607buk9e.pdfIn PDF document text
    • http://cocobuka3.xyz/tiloxigzbih.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/2hgIr1s/47654443400.pdfIn PDF document text
    • http://lnstagram-helping.live/juxasujadaezfr.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/eQMgcjj/head_soccer_world_cup_unblocked_weebly.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/e62bed6ba.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/XxphfGj/love_live_all_stars_team_building_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/paxabuxutujo/hghgdGQ/wejubodaxodukaratuvipeg.pdfIn PDF document text
    • http://bathforlegs.xyz/115578720831qe85.pdfIn PDF document text
    • http://parhelifrl.space/muhakemet_l_lugateynq5ylv.pdfIn PDF document text
    • http://qlemelest.online/ffxiv_arcanist_leveling_guide_2019b09ng.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/wixatax/9090981241.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/36920218757.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/43292462044.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/timitadizoluvusulomepused.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/71841815730.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/android_phone_master_unlock_code.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/closers_luna_skill_guide.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_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 5528 bytes
SHA-256: aa5f20980ac47614ba823589dfb6aa8a2d22442a2265ca4403e6640038b0423f
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 10628 bytes
SHA-256: 4ac7a0b887c68200918618bd16880119648ce792f3624fb76200352b12c53893
font_02_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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