Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9c2939f546760d…

MALICIOUS

PDF

81.1 KB Created: 2021-03-20 22:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8d6c17a3970df4053e2a7cb4f95a4f0b SHA-1: 253acc6ed7925fcb49d459633bb6046ff97a9e1d SHA-256: da9c2939f546760d4b900cfdfeb2c9ca00eb5c3c2dd3af2c7d3f2d23e309acb7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a site offering a download for 'mobdro apk', suggesting a lure for potentially unwanted software. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the content point towards a phishing or social engineering attack vector.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/wix?keyword=download+mobdro+apk+from+mirror+server PDF link annotation
    • http://redtea.space/crime_scene_notes_exampledufyt.pdfIn PDF document text
    • http://demask.space/duvuzovopej7elz9.pdfIn PDF document text
    • http://bahis-sikayet.com/347966565751ejg2.pdfIn PDF document text
    • http://kurewegunopef.66ghz.com/81948870650.pdfIn PDF document text
    • http://rijalebegag.iblogger.org/human_body_parts_pictures_with_names.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vepilezora.epizy.com/2014_chevy_malibu_haynes_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37451e76-753d-4f92-b921-5a863f64f917/all_my_sons_act_2_quiz.pdfIn PDF document text
    • http://pidaxodudu.rf.gd/57494790399.pdfIn PDF document text
    • http://zapidijerazavot.epizy.com/74265865821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12f1c4d-a2a7-4b76-b8df-cac50dd3187d/12481253141.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/how_to_fix_bosch_washing_machine_not_draining.pdfIn PDF document text
    • http://kefasakawig.rf.gd/bahubali_movie_story_in_english.pdfIn PDF document text
    • http://gisipusizen.rf.gd/12293515855.pdfIn PDF document text
    • http://tuwuxadifire.rf.gd/miniga.pdfIn PDF document text
    • http://vukenorap.epizy.com/48694198983.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/jepatewenurux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19a878b-162b-4160-8960-77ab1343a548/how_to_get_to_mists_of_pandaria.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/trade_commerce_and_industry_regulation_act_1994.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/suwatavifogamewarutowezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e8f2116-2faf-4742-a948-fca85202fccc/the_nightingale_and_the_rose_characters.pdfIn PDF document text
    • http://gofugukalizugo.epizy.com/acidophilic_bacteria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e032dd1-0ae5-49ed-8ba9-f394d23d2543/pesulomikofe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 5544 bytes
SHA-256: c55923f98919d5b14c1f8e6e6bb6a2285880d8b0131c7f52afe0f85b7e79d8bc
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 10536 bytes
SHA-256: 9b8ee3a62c210bdfd71e9ecb6e39b64d28e36e2e5086c3d0c766cc5769fee4e5
font_02_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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