Malicious PDF — malware analysis report

Static analysis result for SHA-256 1700db915a4335f6…

MALICIOUS

PDF

78.8 KB Created: 2021-02-09 17:17:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7370bddbb773991a98d8da37a95ed7d4 SHA-1: db51c6c317e0d63bc02baa42e5f88af6213fb6c0 SHA-256: 1700db915a4335f64dea07170a81f2dd2da4f27764e07f5134c852675c05a4eb
214 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple critical heuristics as malicious, including redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs point to known malicious infrastructure and a large number of external PDF links, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates these malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=nacionalismo+econ%25C3%25B3mico+pdf In PDF document text
    • https://pezimanazeto.weebly.com/uploads/1/3/5/3/135309923/228412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_6022912ccb5a8.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/649e732475fd.pdfIn PDF document text
    • https://sevexuwajewedov.weebly.com/uploads/1/3/4/5/134508994/bozutazenaxaxukuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5fdc5a4ecc2f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_5fe82182dc15e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_5fd9a15a18af6.pdfIn PDF document text
    • https://vedirivokezijil.weebly.com/uploads/1/3/4/1/134108565/patifafezapuzifoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_60132f963ad90.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/1761774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393644/normal_5ff9ddb825d71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rorives/tikisixodufebumunokozeza.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/18918324513.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/chamelephon_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/booty_farm_modded_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/34503299710.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/escape_room_mystery_word_level_34_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/flame_test_experiment_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/65478241964.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/connect_bluedio_headphones_to_android.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/food_safety_exam_questions_and_answers_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/30391579526.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 5020 bytes
SHA-256: 28220f1402d4fdf5040515b684211ab243a6f30d63c85775500ff576e8c200ad
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 11108 bytes
SHA-256: 9364dcb2512b2f9c157e63d8b57be43be151b5c7e61133f7b2f35915e92d3cdd
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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