Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71816b8a9f117f3…

MALICIOUS

PDF

84.0 KB Created: 2021-03-11 04:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e5eab615d0c3e54cd920bb2e2546b015 SHA-1: 20f3a94e71c92b4384afa800c016611551123165 SHA-256: c71816b8a9f117f3f5fbd64a50b7f37f9b59eeaf28bf67033818e41527fc4488
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, suggesting a malicious intent to drive traffic to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing lure or a downloader for further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/award?keyword=lab+assistant+answer+key+2020+pdf PDF link annotation
    • http://fajiriduxir.medianewsonline.com/libro_cerebrito_descargar.pdfIn PDF document text
    • https://jumufewaxijakuk.weebly.com/uploads/1/3/1/3/131380308/10e97e7.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/fopamuginusugulidav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_60073330d24ae.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/dreamworks_how_to_train_your_dragon_legends_book_of_dragons_full_movie.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/defining_functions_in_python.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/tapobi_xifut_renisoroj_wutigot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5ffad9b33bbab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_603b167f39b86.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/disney_piano_sheet_music_advanced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_6044bd76be984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_60494b2f1998a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_6013e4680f59a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/sukedil/loliwetisapotowowagavu.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/36480230360.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/50090667998.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/codewords_78_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/wivubezelabireraravevebi.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 5616 bytes
SHA-256: 9c766fc649700fdbd533f5c9f11242823adca741f8c579acf908b0c75e9196f4
font_01_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 10184 bytes
SHA-256: 8e6a0c92f82863a15dada7e180ab1366c48f97e78b7f73ae06eb2fbce06c8640
font_03_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 10656 bytes
SHA-256: c9a38f47fddacf2c7377ce0da613bbb85b6d992057832bd3749eca5c786ad21b

Open this report in the interactive analyzer, or submit your own file for analysis.