Malicious PDF — malware analysis report

Static analysis result for SHA-256 d259567fdb6d91f4…

MALICIOUS

PDF

80.1 KB Created: 2021-02-18 22:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 350236811dbc14586243d5287b95f1de SHA-1: d558e5d2491120ce40a1dad57b83597bf0e75a53 SHA-256: d259567fdb6d91f412267c6dacca08c372c889b1d50fe8e51615096bb60bb1eb
314 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including critical detections for redirector links and brand impersonation for credential phishing. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to checking Gmail account availability, aligning with a phishing lure. The presence of numerous embedded URLs, many pointing to potentially malicious or link-farm infrastructure, further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/lojutozoseluzodil.pdf.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://yafferge.ru/strik?utm_term=how+to+check+if+a+gmail+account+name+is+available In PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/lojutozoseluzodil.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/jbyjdnh/marco_s_pizza_nutrition_thin_crust.pdfIn PDF document text
    • http://fullcreditreport.info/xepeg07sx5.pdfIn PDF document text
    • http://juilopkiretlo.ru/anaganaga_oka_prema_katha_movie_songspo1ds.pdfIn PDF document text
    • http://momentshop.website/dinosaur_battle_videosapn8d.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/3224677.pdfIn PDF document text
    • http://tumbochka.space/android_auto_apk_4._5._59sexte.pdfIn PDF document text
    • http://znasila.ru/82498329712l998f.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/f56b9c6.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
    • http://bogepep.rf.gd/malta_marine_accident_incident_report_form_a.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/mancom_report_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/50542674042.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/tofet.pdfIn PDF document text
    • http://kepemusodokiwif.rf.gd/purolavasuwexonifaguva.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/11826954365.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_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 5396 bytes
SHA-256: c09e1f760c949003832a69744d2280e5509191fbc1fbd15d78eac963bc2801fa
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10644 bytes
SHA-256: b33eb7a3a55f382274d1248c0167a4b9eb827cb28184ab76731df9d1e9bafe24
font_02_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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