Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be11d7aea056300…

MALICIOUS

PDF

78.3 KB Created: 2021-02-12 21:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d44ef68db490b9de82d1d06ec45578ef SHA-1: 8c03f4fc4827d8e878689617f39de9dec2612ac5 SHA-256: 4be11d7aea056300a9a399caf1b5e42018e37bb9fd61e3b526177e98a2f15fcc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external links, 'https://leonvi.ru/wix?keyword=cross+country+scoring', suggests a lure related to sports scoring. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.999767 strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=cross+country+scoring
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/kugopajuxigol-dejado-bisekesu-jatanirila.pdf
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/vakuvomufufu.pdf
    • https://wiguvebilef.weebly.com/uploads/1/3/5/3/135389097/1441202.pdf
    • http://0fruits.space/sosozuforu20zg5.pdf
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/balopejumefodali.pdf
    • https://cdn.sqhk.co/gixezovof/8ijgtgj/all_format_video_player_for_android_free_download.pdf
    • http://detonic-de.website/41599763880lfd9r.pdf
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/ec6bf2ad.pdf
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/nirite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juvetaso/18382596286.pdf
    • https://s3.amazonaws.com/lukepepe/fitbit_versa_apps_to.pdf
    • https://s3.amazonaws.com/kafises/acapella_songs_gospel.pdf
    • https://s3.amazonaws.com/lixuzo/rexasofawuninupiderig.pdf
    • https://s3.amazonaws.com/xaliwalufoguni/19698847899.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f712.bin
219ca3f0b08359775f461b741f84511e6c27a677a73f3b451b6358063addd816
pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 4732 bytes
font_01_sfnt_off00010746.bin
fc6ad6f41e52ae89fc835b3c0f7bb550d6afee4da78fd9eebfcd277f562cb036
pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 10380 bytes