Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd23f1fd15a4f382…

MALICIOUS

PDF

79.0 KB Created: 2021-05-05 20:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eab4e242ac71f7fd358a005809befab2 SHA-1: e0b6a4c10665da42e385395fe503a03d9e936157 SHA-256: dd23f1fd15a4f382590861025d69d22f4fa677bcf3dd2fe60cd988a4183ceebc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs and the heuristic firings indicate that this document is designed to redirect users to malicious or spammy websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=what+are+the+automation+tools+for+testing PDF link annotation
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/fuvujuzivusonivek.pdfIn PDF document text
    • http://boguvijuximu.22web.org/xoxegupofopufopuvavogere.pdfIn PDF document text
    • https://sifurimunudop.weebly.com/uploads/1/3/4/3/134328932/5643815b48c.pdfIn PDF document text
    • https://cdn.sqhk.co/madeparev/FjhEwji/75889283256.pdfIn PDF document text
    • https://matigolexa.weebly.com/uploads/1/3/2/6/132682665/nonejokijofe-gekalo-rebewases.pdfIn PDF document text
    • https://vijekufimukij.weebly.com/uploads/1/3/0/9/130969895/7091899.pdfIn PDF document text
    • https://gipimosikiji.weebly.com/uploads/1/3/5/9/135963651/xemon.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/gfijijK/fazutasige.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/IFheie1/movie_quotes_about_life_funny.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/jiiCm5m/best_video_player_for_android_slow_motion.pdfIn PDF document text
    • https://cdn.sqhk.co/gesuwetok/fms1agj/54481224115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486051/normal_600321b6d6a6d.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/935228.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/c8jfMBn/fedibuzakezalemitujuvulu.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/gQib3ig/can_you_escape_2_level_27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449411/normal_5fe58030242d7.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/sokuvubutidu_sutow_solememixa_mitaxedetubazel.pdfIn PDF document text
    • https://gumulopeviw.weebly.com/uploads/1/3/5/3/135348062/kavuxup-zitikamizikoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tenubitifane.rf.gd/general_chemistry_exam_questions_and_answers.pdfIn PDF document text
    • http://kolosavozogu.rf.gd/how_to_analyse_art_work.pdfIn PDF document text
    • http://xumametubedax.rf.gd/fajovawu.pdfIn PDF document text
    • http://nixikoko.epizy.com/jikurira.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_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 5196 bytes
SHA-256: e7a5cc91982b156ba693ad1c0f1c1141e87adaf442df121b2c012276a8793822
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 10716 bytes
SHA-256: c8d38e97798b2e4c92452ac6b67ad47e20edef4756ad1ff0801f7f1289239781