Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c9255118f17bd4…

MALICIOUS

PDF

75.0 KB Created: 2021-06-11 09:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f4a5fb3beae89adcc70ab329bbbd3e8 SHA-1: c540f0a7d0c237cd36acd6b901a1989dd4fefac2 SHA-256: 33c9255118f17bd4b955bb146e47e78e435b9489e6874f091bfc2aa4b34b45d4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://bologen.ru/123?utm_term=performance+appraisal+form+free+samples PDF link annotation
    • https://tinuxapesizagi.weebly.com/uploads/1/3/4/4/134440362/fipuri_zuwosuwiz_pokitirubawop_giguna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_6013322833c25.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/wirowedezid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_603c43cc261ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_606690fcb2efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_605f0bfba1d4c.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/8f35d7a98a9ccce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_60557677e149a.pdfIn PDF document text
    • https://kowulenube.weebly.com/uploads/1/3/2/7/132740682/5999728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_606b588d51645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426260/normal_606c5a1f73799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_606ca06361964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_602bfc87ce682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446502/normal_603d2ca0129fb.pdfIn PDF document text
    • https://vesodebeso.weebly.com/uploads/1/3/4/3/134314426/a56cc3d80f3ec67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_604f520f4bb48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a9a4e6-df92-4a67-ab64-78a221500d0a/basic_english_grammar_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd8fd71-6a7b-47e9-a7f8-7cd19915416d/what_is_caste_system_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67c78b0-c980-4072-93a2-076f6fc39d44/how_to_make_a_truss_bridge_out_of_toothpicks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ad3f02-88c1-4db1-8a4d-44d7ac82ec0a/pizorajimavetipuvap.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_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 5164 bytes
SHA-256: a29ddca085417b9dd452e9dde64128eda11fd7ecb94d69098f83afa4256c0bbc
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 10468 bytes
SHA-256: de31afe57dd3c5785570c07c68692014f77554ac5d9e2d72f7a1e893bbe270d9

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