Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32852ec9e9a807c…

MALICIOUS

PDF

68.6 KB Created: 2020-12-19 04:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a6c1ccd5b336e002d61eea26744d2d00 SHA-1: 5861b857b7abe2a33fbb1f368ecbe87771316e51 SHA-256: f32852ec9e9a807c3ca332f0c56fdd1ff330e355a53c081db39ebb48f5c0731f
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru', which is used in phishing attempts. The document body, though heavily obfuscated, contains text related to 'Openvpn server apk download', suggesting a lure. The presence of numerous external PDF links, some pointing to benign S3 buckets and others to unknown or potentially malicious domains, indicates a link farm used to distribute malicious content or improve SEO for phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/strik?utm_term=openvpn+server+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f9391d4d0141.pdfIn PDF document text
    • https://sekiwamabo.weebly.com/uploads/1/3/4/7/134729119/1118865.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/suvex-xebubonozov-gavubukegago.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/teteditaxofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_5fb749c3aa75f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5fc97779456e9.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/xedafaxefopet.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/vibuvomomuv/helix_waltz_lecture_of_barris_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/44703988846.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/pdfmake_angularjs_html.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/phn_mm_chia_s_wifi_trn_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bd0f0f-defd-4a7c-80a1-4df3e3a39d23/zerolugabigame.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/94293303877.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_off0000ba10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA10 5196 bytes
SHA-256: e133f80194e8fb433ae01721d3d1a1143a0807c97612b9e926bf5c2655c30151
font_01_sfnt_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 10992 bytes
SHA-256: f773d3ea15eef77243a7a8185197a55dd68a6c0adfde86c58e25390007f600ed
font_02_sfnt_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 16208 bytes
SHA-256: 51c0c474e6ed7f8cec1afc4a08041c0624779336ec807756389af866c62e5643

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