Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5660292a1664c41…

MALICIOUS

PDF

91.0 KB Created: 2021-04-27 07:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 250e8e10fbc59637687a6afc5a54f40a SHA-1: 30a3770f5a6496403d24558ac552ae254bcde9fd SHA-256: c5660292a1664c41758ff4ef3600ed14cf13a046985feb694671a50638685177
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL that, when clicked, likely leads to a malicious site. The document body, though heavily obfuscated, references 'data structures interview questions amazon', suggesting a lure to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=data+structures+interview+questions+amazon
    • https://cdn.sqhk.co/kimejijomaki/c7gfgda/tle_parent_portal.pdf
    • https://static.s123-cdn-static.com/uploads/4365619/normal_60028547c7028.pdf
    • http://suwubiwutej.iblogger.org/paradise_lost_book_1_plain_english.pdf
    • https://cdn-cms.f-static.net/uploads/4423462/normal_5fd8ceb4ddc58.pdf
    • https://cdn-cms.f-static.net/uploads/4425507/normal_60149f462106d.pdf
    • https://static.s123-cdn-static.com/uploads/4492240/normal_5fe1264d25e3a.pdf
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fca85e765c0d.pdf
    • https://cdn.sqhk.co/pujixefan/Osijyja/rovuzesewunalibevowor.pdf
    • https://cdn-cms.f-static.net/uploads/4459629/normal_606e2a54c5776.pdf
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fda3cf3e1bba.pdf
    • https://cdn-cms.f-static.net/uploads/4496389/normal_603a941cb3281.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kexamoxusinixu/amc_8_distinguished_honor_roll_2020.pdf
    • https://s3.amazonaws.com/wupagivoz/the_wave_movie_review_2015.pdf
    • http://gudoxigamodire.rf.gd/noveguwamilotowitumibu.pdf
    • https://uploads.strikinglycdn.com/files/6d7b8f31-23e8-44e9-9a05-3ca0ebef0461/65083607337.pdf
    • https://s3.amazonaws.com/memexelu/82773322525.pdf
    • https://uploads.strikinglycdn.com/files/24f6b777-b69e-4328-871a-f27943db298b/86743967430.pdf
    • https://uploads.strikinglycdn.com/files/30e1c566-1a3f-47c6-b4e9-81adc4d96168/35728663138.pdf
    • http://mibaruruluket.rf.gd/defozigijunavedime.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f653.bin
629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 6440 bytes
font_01_sfnt_off00010647.bin
36eca841ad065c92b56f375c5f61c936088d3486bee9fddebbdba659f369526d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 5240 bytes
font_02_sfnt_off00011822.bin
fcf494f6edd387dc2913f6f4f3fc52f6037927897457ad39eea5ed5ceab5c353		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 3056 bytes
font_03_sfnt_off00012507.bin
2e9b237dad0698496c11bb958718c3b20c1eed4d327ad6c98e5721f7e9fd4099		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12507 10512 bytes
font_04_sfnt_off00014937.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14937 16036 bytes

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