Malicious PDF — malware analysis report

Static analysis result for SHA-256 761738611852d97d…

MALICIOUS

PDF

106.2 KB Created: 2021-05-11 22:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aa7ff33a4599440f5255c75476ba0c82 SHA-1: 2e6fac9fb54d8ad80c6f93f846bbec2ed1b4214c SHA-256: 761738611852d97df22166ebd9312f1319e01df8e3abbcb7fe028cc2cbd4c9ce
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and an embedded URI pointing to a suspicious domain, indicating a phishing or malware distribution attempt. ClamAV also detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to contain metadata related to a product, likely used as a lure. No scripts were extracted, but the presence of external links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=beretta+92fs+compact+without+rail PDF link annotation
    • http://zunololanuxigu.sportsontheweb.net/ways_of_seeing_john_berger_free.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/66249326995.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_0c7495fbe97c4200923456cc84e58165.pdf?index=trueIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_d9afb73a41294daf8e9a87f5f575cca5.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_7dc5c5cd3b4f44e483af0e8e01b14f49.pdf?index=trueIn PDF document text
    • https://619c993e-e215-4b07-891b-88776ecab8c8.filesusr.com/ugd/1fce43_bcaf957beec848f1865b430ccbfd138b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/mikomugoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90df54d9-2b37-4979-9b44-ac6693e09259/how_to_train_mental_toughness_in_sports.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/bixemaloxarexujul.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/twitter_media_er_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/filmywap_punjabi_movies_2019_shada.pdfIn PDF document text
    • http://pisonepegosa.myartsonline.com/78473852038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b4792d-2445-4595-b945-e35dadfe3b7c/jujimixifaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92e89b4-d9de-40e4-9320-df18e4928347/52065124593.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/56326419597.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/52062209946.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/cauplas_catalogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71aca67-4854-4bcf-9044-322aa89b09ab/vekotugavapidatugekif.pdfIn PDF document text
    • https://90b6428a-f85d-4fb4-90f7-6cca40d0dc23.filesusr.com/ugd/55544c_f991930dd7454526a7ef3162684457a5.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_752cd6a848b642dda79da6b79623a9be.pdf?index=trueIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EC 5684 bytes
SHA-256: 354c4a91a4fbe3ca440bb2e88176c251cb4e02ad3285a7a0fa5d62c265926b79
font_01_sfnt_off00015821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15821 8248 bytes
SHA-256: 9b1457220991ded9ed0684987916172977b505cd924890624acc17270a620ce8
font_02_sfnt_off00016e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E95 14360 bytes
SHA-256: c9a1bdd955519b6e4ae7a4315b56421067fa6477a8adad528fc10f75fcfb130b

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