Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbe37e43dbee827…

MALICIOUS

PDF

118.6 KB Created: 2021-04-07 18:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 955265105056d2b65e917d7e15855567 SHA-1: 39ea52945eceb3fbd3c610d04b975bdc58aae4be SHA-256: 9fbe37e43dbee827212403345e6c9ad813aa1070c7e52b8513c433d733e4b0c2
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or SEO poisoning tactic. The presence of a redirector URL and the ML classifier's high confidence score indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://seumenha.ru/strik?utm_term=features+of+the+act+of+uniformity PDF link annotation
    • https://jijiluvupetopib.weebly.com/uploads/1/3/4/6/134644839/nolalavelo.pdfIn PDF document text
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/biwemirusef_pitexibe_kisasero_lalape.pdfIn PDF document text
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/9032589.pdfIn PDF document text
    • https://lisopivoxo.weebly.com/uploads/1/3/4/9/134901835/60bbfd.pdfIn PDF document text
    • http://retoxen.mypressonline.com/91290872262.pdfIn PDF document text
    • http://biwumani.mywebcommunity.org/mavalazakalon.pdfIn PDF document text
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/loxoganedejedol_naberud_xevozexuxovonoz_vesefevusixeb.pdfIn PDF document text
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/tuxugolalujabug_zuteragisadap_futigijis.pdfIn PDF document text
    • https://potunajasufa.weebly.com/uploads/1/3/1/3/131381619/4d361a70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_6a5f2b3f81f2491080cdfee2c1cb83fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/pencil_drawings_of_animals_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be1443f-06a2-4dfd-a379-a27941b3d2b4/55960000351.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/54563771981.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/8865720559.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/arcsoft_collage_creator_1._0_free.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_dd49a793b3c44ff98cf7b8ee2f70fc76.pdf?index=trueIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_efef0a45a6e64b62a756898be4c5c263.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/463f2a3a-b40e-4a45-a544-c61fc375e925/51346175491.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/mujogalazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c7a512-32fe-46aa-aabe-c53a4ae0c523/32883234709.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/gikamerufuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000eb9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEB9F 56620 bytes
SHA-256: 36bbfd6838232635c69ab1d7644fd402dab2819af911d6215aa2041486c82efe
font_01_sfnt_off000196e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196E7 5148 bytes
SHA-256: 4451b1220d1226ca99219567ffafa2a2ee0cb8d8cbe49dc4732228badcffa264
font_02_sfnt_off0001a84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A84B 10268 bytes
SHA-256: 2e28221bfefa70e76b75948a86e4e31b98d6008c0485173c74337d5b426065bf