Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2f5bada56b5946…

MALICIOUS

PDF

80.7 KB Created: 2021-04-07 04:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b53ea4fa0a21ffee229b5e906d688fc8 SHA-1: 261232a0f1f4496aff2508a2814867240380c5d1 SHA-256: 1c2f5bada56b5946407aebb83f45e006d9843e0ce9c917abba1bc4a49cc43951
254 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to lead users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs, such as 'https://dafemum.ru/123?utm_term=assumption+log+template+excel' and 'http://kittyplay.online/kuwimubuwarekuduwetosdvvd8.pdf', are likely used to distribute further payloads or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=assumption+log+template+excel In PDF document text
    • http://kittyplay.online/kuwimubuwarekuduwetosdvvd8.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/visual_spanish-_english_bilingual_dictionary.pdfIn PDF document text
    • http://hq-cleartv.info/best_free_movie_maker_app_for_iphonen6uuw.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/angles_in_a_triangle_worksheet_doc.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/wifitufilat.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/google_play_services_update_apk_apkpure.pdfIn PDF document text
    • http://bullbananavannaone.xyz/995358302834obvx.pdfIn PDF document text
    • https://kibimibenafozo.weebly.com/uploads/1/3/5/9/135979164/9770180.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/goodnight_gorilla_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/jizefiniguxosumapavuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_602593aa8d9fb.pdfIn PDF document text
    • https://galinasirisijav.weebly.com/uploads/1/3/5/3/135310000/xopapakojo.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/pajularudugo.pdfIn PDF document text
    • http://dommasters.site/poxesef5055q.pdfIn PDF document text
    • https://zowemuxojawoput.weebly.com/uploads/1/3/4/3/134357794/febe76.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/how_to_pronounce_korean_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/angular_template_tag.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/xulopasixaxelezuzo.pdfIn PDF document text
    • http://gobigs.space/novurixijukfz7e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fc6bb61b6dc2.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/a1bc61.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/jivumuva.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/serenozirovukaluvunomenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 5216 bytes
SHA-256: a944d9f4b6bcac574e822dbbfa9087aa0a489b68eeee3a4885d42549409dd469
font_01_sfnt_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 10360 bytes
SHA-256: ef40074e59462cf63dd7b1b36fd62fdb82fde6a0e294af1ac9c0c9dbea091ebe
font_02_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0