Malicious PDF — malware analysis report

Static analysis result for SHA-256 158612ce4efd5d58…

MALICIOUS

PDF

44.4 KB Created: 2020-10-29 20:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 45bcaac238870b5a9fb16411fd4de228 SHA-1: 77757bec7ca42b314edba81c30c998f2619f859b SHA-256: 158612ce4efd5d582c4059662c2b15e3167f6d9ba7e2bbc6d5a58995819a2b90
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure. The presence of a link farm and a malicious redirector suggests an attempt to drive traffic to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/123?keyword=clearstream+2max+antenna+review In PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/6956919.pdfIn PDF document text
    • https://bupifepubeweta.weebly.com/uploads/1/3/4/3/134336259/veripot.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/lunete-kizoripogifero.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/balasodepinozawurofa.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/2182124.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/henghuili-files2/pdf_to_excel_converter_i_love.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/algebra_2_textbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364cebcb-199e-4dd4-a1cb-b744b2a86c12/ferewurofumetotegiti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3876/1109/files/midaxuremobuzexavuvopur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b54cc0cc-e885-4438-9fb9-d0b9321aac2a/nuwok.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/xebikiposis.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/cambridge_checkpoint_science_workbook_8_answers.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_off0000621a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x621A 4884 bytes
SHA-256: 52922d69564aa71b0ad1f3cee34506e01f1849607ef7653c1e83be2eccbbd4f5
font_01_sfnt_off000072a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A6 10656 bytes
SHA-256: 373940cfc5adad92a6a3bb7d9ebc7a7ec59a5c6af85b90d28928c48779953ab3
font_02_sfnt_off000096ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96CA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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