Malicious PDF — malware analysis report

Static analysis result for SHA-256 0854dd9499950ea6…

MALICIOUS

PDF

85.6 KB Created: 2021-02-21 10:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1a01490e578569c9bdee815ec0ed15be SHA-1: 5dc3683b03c21abe47d3e8e9826aea555f52ceb9 SHA-256: 0854dd9499950ea66c2e36096fe08f9c30dcbe745e49fc3e8791d5978abb5119
222 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external resources, including a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of a malicious redirector URL and the ML classifier's high confidence score strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/123?utm_term=advanced+excel+course+content+pdf In PDF document text
    • http://new-leggins.site/capital_letters_handwriting_worksheetykjdb.pdfIn PDF document text
    • http://sandiego-podcasts.com/calibre_windows_64fglpx.pdfIn PDF document text
    • http://lady-bug.club/dubai_tourist_map_freewtpjh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_601dbd1d8d1f4.pdfIn PDF document text
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/c365e189f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_601f260c66192.pdfIn PDF document text
    • http://study-english-05.site/66104265140onei1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5ffd3c3d21ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5fd2563d2cbce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5fdae29c2d2de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426832/normal_5ffefb953094b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443812/normal_5ff49a23ed0b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fc7391712691.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/penale/mijekagukujimonotisetawa.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/lilujedug.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/android_watch_faces_citizen.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/how_do_i_write_on_photos_in_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/parkside_plunge_saw_with_guide_rail.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 5268 bytes
SHA-256: 515d298de698accd8fdcd1c923ac171d137e9bb78251ad5ef133e551cfa03cf8
font_01_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 11648 bytes
SHA-256: bb7fbe1d7908897851557167ee6087119ba73f7dd0f00adbe3b9784c36a2a072
font_02_sfnt_off0001344b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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