Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca756986c9b293b…

MALICIOUS

PDF

67.3 KB Created: 2021-02-05 10:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3718fd603fb7462e5de364390de57726 SHA-1: 7dafeab39799f2d13ce3792373380b430ad50474 SHA-256: dca756986c9b293b57b6bf7e87bb115430b4337e48437f3682dd0eb5f12d35e7
192 Risk Score

Malware Insights

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

The PDF contains multiple links to suspicious domains, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The presence of a 'download button' heuristic further suggests a lure to download potentially malicious content. While no scripts were explicitly extracted, the PDF structure and link farm characteristics indicate an attempt to direct users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/aws?utm_term=baby+funny+images+free
    • http://losmopaka.site/free_download_photo_collage_software_for_pct036x.pdf
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/jegajejifazefif_pazak_ludaju_pefolon.pdf
    • http://ovca.space/riguniohwdz.pdf
    • http://lnstagram-helping-centre.com/matematicas_6_primaria_santillanaqjr74.pdf
    • http://prizinsta24.site/uma_teoria_cientfica_no_pode_ser_entendida_como9x9sw.pdf
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/mipudaga.pdf
    • http://naturwows.space/solucionario_ctm_mc_graw_hill2j2v1.pdf
    • http://natorg.fun/daily_planner_templatek5ank.pdf
    • http://ses-paypal.com/funuradulm2di8.pdf
    • https://setuwome.weebly.com/uploads/1/3/0/8/130874340/dogunirezasofelijefu.pdf
    • http://nasporte1.fun/tofogatagita55tse.pdf
    • http://qlemelest.online/howrse_hack_no_downloadeiu3x.pdf
    • http://topshops.website/wordpress_xml_sitemap_without_pluginmjihs.pdf
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/2414256.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://joxumokuri.epizy.com/ballistic_missile_defence.pdf
    • http://kirogebi.epizy.com/acorns_stock_performance.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd87.bin
da048498768e4012d7bab6a06496a026d4e3d545bb3c4fda56e2a8d67e8e14f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD87 5036 bytes
font_01_sfnt_off0000ce91.bin
b619ab9e39dd276cf6512094a4652a09f4a7c6d6efc7cbd8e03ec2d0dd8804f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 10496 bytes
font_02_sfnt_off0000f295.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 4324 bytes