Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf0a998f5c5b557…

MALICIOUS

PDF

80.4 KB Created: 2021-03-19 18:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ae4b4943a3d733915bf001167996ef7 SHA-1: 2b4a8d8906f8f0ce97298fd6c7a553c6983bbe49 SHA-256: fcf0a998f5c5b557d0c4535620569a1cbcaf716576ca7311033bce1d6bcc0b6c
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to educational content ('solving equations with rational coefficients worksheet'). No scripts were extracted, but the PDF structure and embedded URI indicate a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://xezojetit.ru/strik?utm_term=solving+equations+with+rational+coefficients+worksheet
    • http://puliliraforuwu.22web.org/basic_english_grammar_in_bangla.pdf
    • http://dorightunion.com/stranded_deep_mac_freeesudt.pdf
    • http://milanbeachs.space/103426002469ck3f.pdf
    • http://bapefajavijofo.66ghz.com/18894160242.pdf
    • http://astrology-personal.online/dodepopuvamudubisuneverp8txy.pdf
    • http://peromopativej.mypressonline.com/zexivegu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f11e06ea-bb3f-433d-bf76-98f7a44dcb12/mma_unified_rules_judging_criteria.pdf
    • https://uploads.strikinglycdn.com/files/f31baec5-f2e8-48e9-9651-39a6d54e32c1/88393893889.pdf
    • https://s3.amazonaws.com/dowadotiju/mapivowinopojisikopo.pdf
    • https://uploads.strikinglycdn.com/files/d82ced35-e955-46b7-89c5-07a7bd3011d7/simcity_4_guide.pdf
    • http://sonowodiguvab.epizy.com/banda_calypso_na_amaznia.pdf
    • https://uploads.strikinglycdn.com/files/db2bbeb9-8c06-4329-9fb5-09fc076575de/44688669509.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/fade_lewis_capaldi_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/68be836f-eed1-497a-8d06-b91d1f4ed3e8/74530493538.pdf
    • https://s3.amazonaws.com/sumesawoxajew/42700359897.pdf
    • http://vezuzatutuxi.epizy.com/ncbi_blast_mac.pdf
    • https://uploads.strikinglycdn.com/files/08ee423b-c07b-4f82-a835-b28d5d350d8f/kavunonakimabegezisurete.pdf
    • https://uploads.strikinglycdn.com/files/c48a4fd3-d9e3-41dd-a705-b56fb51be603/how_to_write_a_thousand_dollars_in_numbers.pdf
    • http://nosigegu.onlinewebshop.net/14199954945.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/cuisinart_cbk-110_compact_automatic_bread_maker_reviews.pdf
    • https://uploads.strikinglycdn.com/files/3f9ee4e4-4047-4dd4-b138-244456f72e63/34345348534.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f769.bin
0895f0546ba3fa51794d808cb9ad8c4a6851de14bbd2bbe4b7f60cf2774ccd51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 5588 bytes
font_01_sfnt_off00010a7a.bin
ddc51bae7852b72a4154acfd5127b51ca7748571a6fc8e6fefbbc073ccaedd84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 11440 bytes

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