Malicious PDF — malware analysis report

Static analysis result for SHA-256 86857c3500dbc35c…

MALICIOUS

PDF

74.8 KB Created: 2021-02-20 12:29:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d412f03400db8c1dfb9dd9691b8f29f9 SHA-1: 28348d05a63983e7254c2091efcddd22f77a0a48 SHA-256: 86857c3500dbc35cbf2250698f15040581098ec08cb8c0428236faf1e2582ebe
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results for various topics, including 'organizational structure chart template excel'. The presence of ClamAV detection and ML flagging indicates malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest it's part of a campaign to lure users to malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=organizational+structure+chart+template+excel PDF link annotation
    • https://cdn.sqhk.co/kobewudojuvo/bifiiB2/grand_truck_simulator_mod_apk_all_truck_unlocked.pdfIn PDF document text
    • http://rivuxini.66ghz.com/all_sports_live_score_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/jiaijUI/download_sound_effect_youtuber_free_fire.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/laremasapa.pdfIn PDF document text
    • http://lenorimageb.iblogger.org/80125779138.pdfIn PDF document text
    • https://kelesive.weebly.com/uploads/1/3/0/8/130874426/devolufowuzega.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/hajIcia/glory_of_generals_2_mod_apk_revdl.pdfIn PDF document text
    • https://pekavodasusoku.weebly.com/uploads/1/3/5/9/135982803/2360463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448550/normal_5fd04e339c8cc.pdfIn PDF document text
    • http://gikewoxetid.iblogger.org/38936653884.pdfIn PDF document text
    • https://xutekesavugev.weebly.com/uploads/1/3/5/3/135316407/7216170.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/moduxanakuri/vimaze.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/the_art_of_war_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/guided_tours_of_ireland_including_airfare.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/bharat_movie_theme_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/whats_coming_to_disney_plus_australia_2021.pdfIn PDF document text
    • http://gusutawidike.epizy.com/88914457852.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_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 5492 bytes
SHA-256: 94df51084d67d3a5c626a6c325f06307b7fb549f67723ba70c803db8ec23fbc0
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 10068 bytes
SHA-256: 6d30774324b079fa2561665e55851efaa17df08066a9b2839dc64d3596018784

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