Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd7f65ff5df5c0f…

MALICIOUS

PDF

68.9 KB Created: 2021-02-28 13:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 166f044cc166cac0a8d197f914925f79 SHA-1: 217d9cfa63baad9599f0b64e79c4f941ebee14cc SHA-256: acd7f65ff5df5c0f9158dc174a910b6e7b6676fe69f05dcd7d425a35a2d6f41d
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK, indicating a phishing or scam attempt. The presence of numerous external links, some pointing to redirectors, suggests an effort to drive traffic to malicious or deceptive content. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving exploitation or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/123?utm_term=sunbeam+heated+blanket+microplush+10+heat+settings+garnet+queen PDF link annotation
    • https://cdn.sqhk.co/nuvexajamu/haiirIM/operations_management_salary_in_us.pdfIn PDF document text
    • http://profaudit32.ru/50362515779ct68k.pdfIn PDF document text
    • http://douchelabs.xyz/tosofuwobatixexujezedals61hv.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/esibhi9/free_city_driving_simulator_mod_apk.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/3769403.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/sijeweviraj.pdfIn PDF document text
    • http://copytoshka.ru/zapipogufhaunr.pdfIn PDF document text
    • http://5coupon.info/pacific_fitness_zumaaqy4i.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/the_vampire_diaries_season_8_episode_2_cast.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/how_to_read_a_welders_blueprint.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/zumezeviwakiz/73174983124.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/lick_lick_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/is_there_a_recall_on_kenmore_elite_refrigerator.pdfIn PDF document text
    • http://girupesoja.rf.gd/rusujopapajerela.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/vomurojogajap.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_off0000ce8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8A 6112 bytes
SHA-256: 2c057492fca83a21a423696227518f577c865760e3dad6055f06419c002583d1
font_01_sfnt_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 10412 bytes
SHA-256: cef00988ec59623b6dd82bf5261491e0cecc81442e2d942a134c9b9fc365d8e5

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