Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a8d5e5b1a3deb6…

MALICIOUS

PDF

81.0 KB Created: 2021-01-05 22:35:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a32cbc87769fb8a88b3db38f59e7e4d5 SHA-1: e4b0eab79b8eef09e959c269a5f0c43b30e40bad SHA-256: 12a8d5e5b1a3deb679fa27ee1a4255c1dc958aa86ee52c28f82e6ebd898650e0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a "PDF_SEO_LINK_FARM" heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=singapore+math+curriculum+pdf PDF link annotation
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/51e476d8b6d.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/7444737.pdfIn PDF document text
    • https://nagopajasire.weebly.com/uploads/1/3/4/3/134311949/sowukugabuzi.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/rijizutijusakiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5fa6263180776.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/fggTtDc/paleo_general_tso_chicken_air_fryer.pdfIn PDF document text
    • https://vigelabed.weebly.com/uploads/1/3/4/3/134368569/fbf2e1.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/gapivegek/90103954476.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/pygmalion_george_bernard_shaw_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed526942-ae9e-447c-b9cf-13fa68bcdd1d/90685074630.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/american_racing_2_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563de7d8-6a32-4f28-b4af-bfafac784e63/86197703264.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/learn_python_the_hard_way_3_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17842fd9-e523-43b1-a4f6-396ea4c186db/coolified_games_shooting_games.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/75518852423.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_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 5496 bytes
SHA-256: d6c52b5cd2e5a8928cbdbb61a66277813704c977f00416afa284b54fb97ba0ff
font_01_sfnt_off000111a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 10880 bytes
SHA-256: 509298d80ad61e3c43c8c0d111941aab92e2a108a7b4d620d43ecc6ec65aeede

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