Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1064cb2ccd814c0…

MALICIOUS

PDF

68.7 KB Created: 2020-12-06 00:34:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 22686427d919313d0807aa2b78284f6a SHA-1: 16f39760361dfc807336b5e92e5e6847b510936a SHA-256: e1064cb2ccd814c0aa0ae2334be268e3e35c017c73cb705ee749c73512141dd5
164 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 are disguised as legitimate documents, but one prominent URL points to an APK download. This suggests a phishing or malware distribution attempt, likely using a spearphishing attachment vector. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded URLs further supports this. No scripts were extracted, but the overall structure points to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/strik?utm_term=clash+of+magic+s2+8.332.9.apk+download+latest+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387036/normal_5f9a579a9a0b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_5fbf0d96ceafb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367303/normal_5fca7a2caa0f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_5fa9e3e065fd9.pdfIn PDF document text
    • https://xisegebimir.weebly.com/uploads/1/3/4/3/134340076/mitemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_5fabce7dc7673.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/legenapi/the_great_plant_escape_case_1_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/yesterday_beatles_guitar_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1ad1e9-9223-47c0-a4cd-6d3496fcd13f/suzuki_eiger_400_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd1396f-ad97-4888-ba2c-6ce36e6a2483/the_ultimate_gift_movie_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349d0bd1-3796-4467-a4f4-c518cad300fe/sufevagerulirumokovokas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6178fad3-7ab2-402f-81bf-3210a1b8a608/vivofa.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ea8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEA8E 17744 bytes
SHA-256: 2eb6ec1d5e1a05d24994b3aee9d3734f8d059767b09fc2872bca9cc3284a62e4
font_00_sfnt_off0000b08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08D 6368 bytes
SHA-256: 18402c2943028173557bd97777ffcbf8a22bc50fa5b564a0a504641ef19c7220
font_01_sfnt_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 10564 bytes
SHA-256: 863ba4dd16b0081ee60ec7845f1b8e71f5474ad67a33e6b5e235f3228260fa18

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