Malicious PDF — malware analysis report

Static analysis result for SHA-256 043d4fc2f70a0f40…

MALICIOUS

PDF

81.9 KB Created: 2021-03-30 11:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6917330d1302b09d5b125b16f8535d7c SHA-1: 0a5b33dc1224ec165fee20ecbd1853a68f4e08dd SHA-256: 043d4fc2f70a0f408d0d4f2e41e66c9ed8194f88da46be60826bf8476b4949fa
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though partially corrupted, contains text related to "Facebook ads curso pdf", which is likely a lure to encourage clicks on the embedded URLs.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/award?keyword=facebook+ads+curso+pdf PDF link annotation
    • https://cdn.sqhk.co/gobajejuz/ie2iegc/lolexuda.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/iu9gihd/29207472608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5fc8b43a46b54.pdfIn PDF document text
    • http://talinab.iblogger.org/vuxaxalowetowixofurovun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444646/normal_5fde8208341a7.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/ijgfxjd/4_pics_1_song_level_48.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/figotabam/CpMjMid/topamakerukunibovidevezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_829e190d5ab1489ea494e4971665dd21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/abbreviated_form_synonym.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/abrsm_grade_5_theory_2017_b_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/75576499341.pdfIn PDF document text
    • http://doroxepazu.epizy.com/bible_dictionary_book.pdfIn PDF document text
    • http://zaxuvinebojilef.rf.gd/how_to_delete_santivirus_from_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/pga_golf_club_trade_in_value_guide.pdfIn PDF document text
    • http://ramejepazino.rf.gd/free_blank_guitar_tab_template.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_3a8c55c2c1f74d97847d1fe7b06670dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/what_is_the_theme_of_song_of_myself.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
    • 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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 5276 bytes
SHA-256: c01f9f780c4749d54ca1bf3644fc40c68e5bbd0d24153554e4f1fde4612f5ce7
font_01_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 12584 bytes
SHA-256: 9a2fc1381a71e988b5f1754e5fd4516ddbd6b312575342f52fc0193494b6b3af
font_02_sfnt_off000125cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CD 16080 bytes
SHA-256: b118ad4a5f0f66e944d0a6e82a0dad6050c27e77cb1eabf64d07f40874ae21b7

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