Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a33118e6cd09e99…

MALICIOUS

PDF

79.6 KB Created: 2020-12-28 14:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 09a8f3bc1e23c9af08902a2bf5674dca SHA-1: 718c9930e1c1adb16a85ed93e6b1bfc8a1425ce9 SHA-256: 1a33118e6cd09e9977e53fec726867ba4e9c15cfb38fa75f361ac5c4ac814a9e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely leveraging JavaScript for execution.

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://gettraff.ru/strik?utm_term=clover+go+user+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_5fb83a3bce39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f88351274eda.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/gYx3hiN/ice_cream_maker_cuisinart_recipe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fdfc92f7303a.pdfIn PDF document text
    • https://zeruxexo.weebly.com/uploads/1/3/4/3/134373455/36ec2e2bbd21c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_5fdc248329a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5f9ad20a663c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5fc8dea5a874e.pdfIn PDF document text
    • https://cdn.sqhk.co/naketego/FngjWS4/toworovude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f8b124a17ccd.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/jujadodedaruxix/another_cinderella_story_mp4_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a2abe7-f0cc-4979-af20-e975dfc5360c/cuaderno_de_anatomia_para_colorear_booksmedicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87374a0d-2871-4cb6-921a-e96f49185870/loriridosalexakunagola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e90cf56-30fe-4f55-ac34-b2547b024cb9/pro_tec_oil_filter_application_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498d32b6-1dcb-4d44-a8dd-aca32100aef0/purapokirotigi.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_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 4972 bytes
SHA-256: a63eeaf9b629248729e88aaf44f632a7433859ad114116bed1aec72f8631a10a
font_01_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 10880 bytes
SHA-256: 7c544c5cc9c47947dc29c6772c6907427047bec6a6f64dc5e163a46bc39b49c6

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