Malicious PDF — malware analysis report

Static analysis result for SHA-256 198d1e7a7703aac8…

MALICIOUS

PDF

81.5 KB Created: 2021-03-22 18:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 14d753606c883562ca749f7081b4354c SHA-1: eb476517bdb3e5b5039535bca7383e965cb88117 SHA-256: 198d1e7a7703aac817577adb006d85c54a50e3073755fc1cbe4c4de8e64a6498
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=the+throne+of+fire+quotes+with+page+numbers PDF link annotation
    • https://tojoniwov.weebly.com/uploads/1/3/4/6/134602819/d945be4936a04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370080/normal_5fff6dc48eeea.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/mawezoto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366956/normal_60034566a726e.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/khjtxZ8/super_megaforce_power_rangers_jungle_fury.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/vOhagiy/ninja_run_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5ff690db160da.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevevef/Gifjh10/pugalateze.pdfIn PDF document text
    • https://wovinimupilof.weebly.com/uploads/1/3/1/4/131453577/puwaxa_dumatetejonuz_mepulaseve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fc7e5bf2d49f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_600d6e2c60124.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/fexibekirulupona.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/nhfUjgW/59958370905.pdfIn PDF document text
    • https://sufojise.weebly.com/uploads/1/3/0/7/130739234/7479783.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/jiR4InD/dryer_sheet_uses_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/marimejerebo/gulzaar_chhaniwala_middle_class_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/juniper_ex4600_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/dodevejamofigukuzoniba.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/tixigukobilo.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/zawebiretur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 5472 bytes
SHA-256: c73012421d5d5c9cee427670c2230f828dba13b835bb9331fbebcd45360d075f
font_01_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 10784 bytes
SHA-256: 139dc92b225d063ceba592c079fed2bc1f71764affbd8c48edaa5d20c9935364
font_02_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378