Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39bb52dfc061c43…

MALICIOUS

PDF

120.7 KB Created: 2021-03-25 23:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0199d0b1154b873e8082ab916e38dd57 SHA-1: c33747f9402eecdfe68426e069e38497946843c1 SHA-256: a39bb52dfc061c436419baf51038d8295347977035e18b2bac0ef2903cd09420
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://crophysi.ru/aws?utm_term=what+does+mike+india+lima+foxtrot+mean In PDF document text
    • http://zedakobogesa.mypressonline.com/32344678685.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/vrhhfii/wabumikivuvinisigafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_6017173e8b849.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/fCGOsie/tiny_world_dinosaur_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_60251382a885c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff4b0d2e7d49.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/XOmifhh/tidivoxenup.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/iik7jg7/64719353713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_604d3b8bef220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_6010efea8aa27.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/iXif2gp/maxisys_elite_screen_protector.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/Gjfeigf/77912392663.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/L7hguNN/sebijerux.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/69591214889.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/l_encyclopdie_de_la_charcuterie.pdfIn PDF document text
    • http://majedox.iblogger.org/mary_poppins_book_plot_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_604120c957db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_603c57b8f2760.pdfIn PDF document text
    • https://cdn.sqhk.co/mugodetutag/hegRhh1/easy_cake_recipes_with_few_ingredients_chocolate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475728/normal_5fdede61bd9f1.pdfIn PDF document text
    • http://gakofutelaxojo.22web.org/sidanewoxutadak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxudapese.epizy.com/13444363375.pdfIn PDF document text
    • http://lapobikajedive.rf.gd/best_bodybuilding_workout_program.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_off00017c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C93 5292 bytes
SHA-256: 931676588da3f367bcbba5c875a0f6e92966c1608d14ea8a66ddca1b111e71f2
font_01_sfnt_off00018e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E79 16556 bytes
SHA-256: 1f1b257994b8a94ded96b2dd504e5f9327304ff1b88626543accdff92af583f6
font_02_sfnt_off0001bf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF26 16116 bytes
SHA-256: ba9b5293d46f42e597c092e757bf770b0226661663f119891d806c1875324a0c