Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a713ba7fcfcf506…

MALICIOUS

PDF

87.7 KB Created: 2021-06-11 04:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6985d2c10c0acbfac944e5d93dca6d95 SHA-1: 93913976bcc684375125da69a34aeff5a05f6b85 SHA-256: 4a713ba7fcfcf5060ec37049f2b4ee65a9ada2c3101b3e529eee34403d85c555
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' pointing to various PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded document body, though partially corrupted, contains text related to 'Complément de verbe cm1' and authoring information, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/pbw?utm_term=compl%25C3%25A9ment+de+verbe+cm1
    • https://betutinixe.weebly.com/uploads/1/3/4/4/134481053/siwoloj.pdf
    • https://zexaloguf.weebly.com/uploads/1/3/4/5/134576330/729061.pdf
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/734dd1f3.pdf
    • https://naxazutip.weebly.com/uploads/1/3/4/6/134610322/8541476.pdf
    • https://static.s123-cdn-static.com/uploads/4482870/normal_5ff2b28baae12.pdf
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5fde8250dd1db.pdf
    • https://static.s123-cdn-static-d.com/uploads/4465556/normal_60b56febaaa96.pdf
    • https://cdn-cms.f-static.net/uploads/4385648/normal_601da742b5af9.pdf
    • https://static.s123-cdn-static.com/uploads/4477139/normal_5ff69ba91fe73.pdf
    • https://cdn-cms.f-static.net/uploads/4495393/normal_60bdf78403aba.pdf
    • https://cdn-cms.f-static.net/uploads/4454977/normal_6026fc6419074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zopilep.pbworks.com/w/file/fetch/144851115/75629884691.pdf
    • https://uploads.strikinglycdn.com/files/4050e0a2-74ab-456c-879d-256c15186dab/ejemplo_de_formato_apa_2019.pdf
    • https://uploads.strikinglycdn.com/files/8d207acb-fb73-4128-b8c0-8aa254507033/fichas_de_refuerzo_matematicas_3_primaria_santillana.pdf
    • https://uploads.strikinglycdn.com/files/745efa8a-24dd-4c39-933e-50a045eb184a/joel_goldsmith_heart_attack.pdf
    • https://uploads.strikinglycdn.com/files/5492820a-7ed9-4828-bb14-049c8937d0f6/90722920790.pdf
    • https://uploads.strikinglycdn.com/files/43f313c0-45f3-4422-8bda-c4f5434a6895/hotpoint_gas_hob_instructions.pdf
    • https://uploads.strikinglycdn.com/files/f5e2e485-b1ab-407b-af9a-c05f8b7fc314/re-3_separation_code.pdf
    • https://uploads.strikinglycdn.com/files/33f47757-a505-4340-979d-25b35576dd99/41469895585.pdf
    • https://uploads.strikinglycdn.com/files/40417925-3b94-4970-a7c6-1e66836a8129/10000_reasons_matt_redman_lyrics_nederlands.pdf
    • https://uploads.strikinglycdn.com/files/f67db44d-c84f-4ffc-83e2-797af804934a/champs_classroom_management_printables.pdf
    • http://fatakalewene.pbworks.com/w/file/fetch/144685824/convert_3d_view_to_2d_autocad.pdf
    • https://uploads.strikinglycdn.com/files/d4c1f2bc-a5a1-4cce-b3fa-359796aefe78/somubitipovavisan.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f237.bin
05cec1f0b4ee4f15235caca64d33e6b161d7f9afafdc55e0622adb056506f7ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 4988 bytes
font_01_sfnt_off000102d4.bin
3ebc9cdc338735d4df77e291e8c37ad01dde2c330cf6fe0f1382562be64c41e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 12692 bytes
font_02_sfnt_off00012bcb.bin
63a00075b6585576fde9faae807a183b846b293c24c764fa28757b45c8a5091c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 16144 bytes
font_03_sfnt_off000140d4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D4 4324 bytes