Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c771ae26a05d993…

MALICIOUS

PDF

138.9 KB Created: 2021-01-06 21:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 29cce251159957bbfca9a66ff7b09051 SHA-1: 4a4452234ff1e77171e879388f45ba7017d7ca19 SHA-256: 4c771ae26a05d993ee2181910b251005ecc1d6eb8b308d6a2c4e46f3ab674fda
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/aws?utm_term=eviews+10+user+guide+ii In PDF document text
    • https://duxujofibedusor.weebly.com/uploads/1/3/4/5/134577283/4aab34f20d7.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/negejenuxu_fubomudozapaxon.pdfIn PDF document text
    • https://sekatuxu.weebly.com/uploads/1/3/4/8/134894727/1219645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_5fafb9085255c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473618/normal_5fec8d36d79f1.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/mokuwanibof/metformina_su_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/futudibafimivobu.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/2528890601.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/67927427853.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/25291769729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed3f566-272c-47b1-b4f9-eacb5410e1e3/48913846574.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/61698002482.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1FF 5056 bytes
SHA-256: 041f58418c4f0d683542666271c667cd54cbde0220f768dbea7a899f501ef641
font_01_sfnt_off0001d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D35C 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0001debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEBF 12624 bytes
SHA-256: 3dd25b216f30a5b89b478c9d81ea07dc31147fea660f8bc4c7511bfd6540effa
font_03_sfnt_off00020978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20978 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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