Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7275a06ed552408…

MALICIOUS

PDF

76.1 KB Created: 2021-03-29 11:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d510ab3e94867b21f2a18519cfa520d0 SHA-1: d2bcc351e1eb7396d5b7e5d55944ca7a5c672bc5 SHA-256: d7275a06ed552408fbe8d356ca77358862eb13dd913c2c402573d220fe2f5d5c
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature. The document body, though heavily obfuscated, suggests a lure related to 'learning theory psychology pdf', which is likely a pretext to direct users to the malicious URL for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wix?keyword=learning+theory+psychology+pdf
    • http://osthondroz.com/664504875516gb1k.pdf
    • https://static.s123-cdn-static.com/uploads/4481278/normal_60047adc5a3c5.pdf
    • https://cdn-cms.f-static.net/uploads/4372076/normal_602e60193a1d8.pdf
    • http://gusimaziwagax.22web.org/aquatic_ambience_sheet_music.pdf
    • https://cdn-cms.f-static.net/uploads/4460972/normal_5fd1ff7658750.pdf
    • http://cenderaoriginator.com/wefajegawaratopevosidoqlh3u.pdf
    • http://stickerrus.ru/wujevululewezomamab9iq0.pdf
    • http://ru-1.casa/a_return_to_love_summaryn5kv4.pdf
    • https://static.s123-cdn-static.com/uploads/4420588/normal_5ff45207930c8.pdf
    • http://aov.one/how_to_program_marantec8v3yf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/donukadizolin/b1_english_grammar_exercises.pdf
    • https://uploads.strikinglycdn.com/files/88a6dbf8-62e0-4eb9-943d-51f7f3e8e335/35594641167.pdf
    • https://uploads.strikinglycdn.com/files/fb5cf973-8ecc-42c0-8375-d4708c9bbb26/fojawibigu.pdf
    • https://uploads.strikinglycdn.com/files/e45f671f-3395-4f5f-860f-9ddffdcadf67/tanogowi.pdf
    • https://uploads.strikinglycdn.com/files/a8451d5d-eb28-4489-a482-dd66a6da1ab9/61057643245.pdf
    • http://fuxapab.epizy.com/17980601927.pdf
    • https://s3.amazonaws.com/sinadi/clownfish_care_sheet.pdf
    • https://s3.amazonaws.com/tumasun/fios_quantum_gateway_router_best_settings.pdf
    • http://sunotewisutexo.epizy.com/business_ideas_in_telugu.pdf
    • http://lewafozilit.epizy.com/mr._coffee_coffee_maker_reviews.pdf
    • https://s3.amazonaws.com/wizomoravazub/23002417237.pdf
    • https://s3.amazonaws.com/ragejufa/kafawitewon.pdf
    • https://uploads.strikinglycdn.com/files/c50e3d4c-4ef8-40c8-8c12-8e4f25458dc8/mumowakutadujepolu.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_off0000eb62.bin
c057f08d7171c99055cd0273070bd281c448709f9ee38540ed117690c05e5931
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 5460 bytes
font_01_sfnt_off0000fdff.bin
8982b3e7e604d82dd9e78e4a5de72411bbd7089aae90dc3887f041b01c2cb592
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 10976 bytes