Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7e9ed41f2fdabd…

MALICIOUS

PDF

75.8 KB Created: 2021-03-24 10:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 63c26fa80ae78d6c8af218cf0af4817f SHA-1: cc67a0ab325838e4c5b31d1474d43aaff386ab38 SHA-256: 6b7e9ed41f2fdabd7c457c43ac0e7e17ef0324bd71a95e8419b25da81c69c975
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized redirectors and link farms, suggesting a phishing or malware distribution scheme. The presence of ClamAV and ML heuristic firings further indicates malicious intent. The embedded URLs are likely used to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xajibur.ru/wix?keyword=the+horse+marching+band+pdf PDF link annotation
    • https://zobujopexa.weebly.com/uploads/1/3/0/9/130969678/742912.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449170/normal_5fe3b987025fd.pdfIn PDF document text
    • http://nusoxex.iblogger.org/28237185776.pdfIn PDF document text
    • https://cdn.sqhk.co/befulirawid/bPhiFii/overkill_s_the_walking_dead_ps4_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5ffba2eff00bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405644/normal_5fedc218cbd05.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/6hcijif/microsoft_launcher_vs_managed_home_screen.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/EgehbYI/the_adventures_of_tintin_trailer_2011_official.pdfIn PDF document text
    • https://sarotokatot.weebly.com/uploads/1/3/2/6/132682281/9384640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_511271a6c77b474da8ac9eaa815d05b8.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_e198d081c5474eb3ae9a4fad8e46eebf.pdf?index=trueIn PDF document text
    • http://lutubipejor.rf.gd/how_to_service_ducted_air_con.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/lifutin.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/backtrack_6_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/vomurojogajap.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/7694716635.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/ginenapesuro.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_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 5624 bytes
SHA-256: bce894aa1c7417f825f0c2a9b7bcaf961a329859d9fc706c1a1846ca31db6108
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 10928 bytes
SHA-256: b7ca80cfa406564a5e411763e759c7c85b5c7e0d4b158570f987ec8b8acd5970

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