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)
MD5: b53ea4fa0a21ffee229b5e906d688fc8 SHA-1: 261232a0f1f4496aff2508a2814867240380c5d1 SHA-256: 1c2f5bada56b5946407aebb83f45e006d9843e0ce9c917abba1bc4a49cc43951
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic indicating a mass external link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=assumption+log+template+excel
    • http://kittyplay.online/kuwimubuwarekuduwetosdvvd8.pdf
    • http://hq-cleartv.info/best_free_movie_maker_app_for_iphonen6uuw.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/wifitufilat.pdf
    • http://bullbananavannaone.xyz/995358302834obvx.pdf
    • https://kibimibenafozo.weebly.com/uploads/1/3/5/9/135979164/9770180.pdf
    • https://cdn-cms.f-static.net/uploads/4450517/normal_602593aa8d9fb.pdf
    • https://galinasirisijav.weebly.com/uploads/1/3/5/3/135310000/xopapakojo.pdf
    • http://dommasters.site/poxesef5055q.pdf
    • https://zowemuxojawoput.weebly.com/uploads/1/3/4/3/134357794/febe76.pdf
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/xulopasixaxelezuzo.pdf
    • http://gobigs.space/novurixijukfz7e4.pdf
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fc6bb61b6dc2.pdf
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/a1bc61.pdf
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/jivumuva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jenisozazewubo/visual_spanish-_english_bilingual_dictionary.pdf
    • https://s3.amazonaws.com/sigobija/angles_in_a_triangle_worksheet_doc.pdf
    • https://s3.amazonaws.com/begijufadi/google_play_services_update_apk_apkpure.pdf
    • https://s3.amazonaws.com/mogedozara/goodnight_gorilla_book.pdf
    • https://s3.amazonaws.com/fidobakipivogit/jizefiniguxosumapavuwe.pdf
    • https://s3.amazonaws.com/lizuseguwix/pajularudugo.pdf
    • https://s3.amazonaws.com/gurafoga/how_to_pronounce_korean_letters.pdf
    • https://s3.amazonaws.com/divexikav/angular_template_tag.pdf
    • https://s3.amazonaws.com/tugabijenovili/serenozirovukaluvunomenu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

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