Malicious PDF — malware analysis report

Static analysis result for SHA-256 647ef60b8f8051c1…

MALICIOUS

PDF

114.1 KB Created: 2021-05-25 16:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e7e78e010d5fb0ae405a8b09b7275502 SHA-1: 55650ec023ebf1757e0eea2fc051db920d3d72b8 SHA-256: 647ef60b8f8051c16e50dfa8c2d9cdf6ff55cdbaf3399368eaace4dba88ca404
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying a 'PDF link farm'. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of numerous external links suggests a redirection or download mechanism, potentially leveraging embedded JavaScript within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=are+emp+jammers+illegal PDF link annotation
    • https://jadotonevuwupu.weebly.com/uploads/1/3/1/4/131407011/razex.pdfIn PDF document text
    • https://zugavalomiseba.weebly.com/uploads/1/3/6/0/136082075/28a27590cb2e4ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5ffcdb78dced3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_60462c7d5f734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481162/normal_5fe6878d5cffb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_6006c035b4042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_601bab0a3fcfc.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/9045339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5fe902b03b259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_6051f50cbc2f5.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/dibedamoka/61262340492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0753f666-66ec-4dca-9b02-d1e7b0ee232c/cuisinart_coffee_grinder_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/44309085455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe813a1-217c-41e2-9f40-d6f4ba56e558/power_point_de_primeros_auxilios_para_nios_de_primaria.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/movonovomasolomunafuxil.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/bajrangbali_animated_wallpaper_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/car_parking_allotment_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/4318654964.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/feliz_navidad_words_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/najokaganupefu.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/8811688251.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_off000180ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180CE 5204 bytes
SHA-256: c7e899271582611645a9cfd8f86de2fc9001da19c9d50cd99852bc7c41373a3b
font_01_sfnt_off0001926a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1926A 11980 bytes
SHA-256: c26bcd2b970ed3b28cff7886f1c3c6f984702bcd0e92b618c0cb3b198cfc07f1

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