Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd93acb9224e80e5…

MALICIOUS

PDF

86.7 KB Created: 2021-03-01 10:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c5526c0252f1715b7d78cd67a2e4678b SHA-1: 54d4f056035deea56917b51918db991774666b21 SHA-256: bd93acb9224e80e5694cd994b372bee6d1bc873d87ca49aa8e883d24aaa7a7ab
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged for containing malicious redirector links and a large number of external PDF links, likely for SEO manipulation. The primary malicious URL identified is https://dafemum.ru/wix?keyword=world+history+spring+final+exam+review+answers, which redirects to potentially harmful content. The document's structure and embedded links strongly suggest a phishing or malware distribution attempt, masquerading as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/wix?keyword=world+history+spring+final+exam+review+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416502/normal_603c2eedb6d4f.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/furepogiforuxokuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446650/normal_5ffc593b52e0c.pdfIn PDF document text
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/jurofufipi.pdfIn PDF document text
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/9983153.pdfIn PDF document text
    • https://sezifiloxoxo.weebly.com/uploads/1/3/5/3/135348424/a6c23dc2a06ccd4.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/5006262.pdfIn PDF document text
    • https://sojenumodab.weebly.com/uploads/1/3/5/2/135296615/4255195.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/35a66fbe89b85f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470703/normal_5ff502b45bd88.pdfIn PDF document text
    • http://gagerovovus.22web.org/rodesofinijamuninase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/ndtv_india_news_app.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/noxifazujokukuf.pdfIn PDF document text
    • http://galizojiga.rf.gd/decision_tree_analysis_example_pmp.pdfIn PDF document text
    • http://mumupaju.epizy.com/xosujiroka.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/disturbed_sound_of_silence_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/lelepisiludaviroripoku.pdfIn PDF document text
    • http://xenivut.epizy.com/professional_email_templates_for_business.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/information_integrity_classification_level_types.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 5792 bytes
SHA-256: af1e4e79b46aba8882c063e24cbcacec047cd21b34682a466c74ba5aba95b44a
font_01_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 11476 bytes
SHA-256: 9307b296911a0fee1a1cedd7409d64b14ebc100da964e67ad8f6ef01c4328b3e

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