Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2dc0b0dba0b525…

MALICIOUS

PDF

79.5 KB Created: 2021-01-12 13:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 197768813f8c042537624936bf4303cc SHA-1: 12abd2be879e932b50e16e54511e2d1c8f5f6193 SHA-256: 1b2dc0b0dba0b525eab038d8ca84bb41abd57055c400453347a5950d1d077d4e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one critical link pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/aws?utm_term=dasavatharam+telugu+movie+naa+songs In PDF document text
    • https://site-1178965.mozfiles.com/files/1178965/99906653297.pdfIn PDF document text
    • https://site-1177969.mozfiles.com/files/1177969/focus_on_ielts_key_answer.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/11566447235.pdfIn PDF document text
    • https://sirubiruxegame.weebly.com/uploads/1/3/4/5/134581195/849da.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/lupasupezoposozimu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413117/normal_5fc9c24022ccb.pdfIn PDF document text
    • https://site-1185743.mozfiles.com/files/1185743/84623487038.pdfIn PDF document text
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/7134461.pdfIn PDF document text
    • https://nunezujotegu.weebly.com/uploads/1/3/4/3/134312528/sujekagut.pdfIn PDF document text
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/nafejijikedevupax.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/5034486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wavunot/who_authored_the_rizal_law_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/sales_contract_deposit_template.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/sakulomarevizazu.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/sjcam_sj4000_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47D 5040 bytes
SHA-256: 0d979c089f051487b9840db059b349d360e067f27d363d83d053aea8bc3c0555
font_01_sfnt_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 2132 bytes
SHA-256: 50bc32abb783de35d197f543013970f7d0b8a932a568b150997a367707a7f48a
font_02_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 15452 bytes
SHA-256: 09483574ad873ac851b3d42b10be515a8d229b0ac9761d4104ae5c611f802a37
font_03_sfnt_off00012061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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