Malicious PDF — malware analysis report

Static analysis result for SHA-256 6958fd5a63b6216d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-02 11:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b26fcd941a938635cefd08513021a285 SHA-1: dad29e5c2a96f6ec4f99b3457276fccbb83983e2 SHA-256: 6958fd5a63b6216ddcc10172cf6528fa146e317ab4ba9ed39c4e7c282e568840
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it acts as a link farm, potentially leading to a download or phishing lure, with a specific finding for a 'download button' and a 'callback lure'. The presence of numerous external URIs, many hosted on disposable domains, further supports a malicious distribution pattern. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • 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://xajibur.ru/strik?utm_term=charger+for+doro+flip+phone PDF link annotation
    • http://kefipipina.22web.org/chemistry_chapter_10_test_b_answers.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/c_interview_questions_and_answers.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/eba_guidelines_on_outsourcing_summaryn1wem.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/jDgfif9/cute_animals_wallpaper_cave.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/40258e4.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/how_does_wic_calculate_income_for_military.pdfIn PDF document text
    • http://odemebayisitrafik.com/netflix_apk_para_android_9k8q0k.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/tiwubadavugonavojodena.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/KjbP9gf/37847566034.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/22938704462.pdfIn PDF document text
    • http://getfreecreditreport.info/sears_roebuck_sewing_machine_cabinetvigf1.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/44727205766.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/f1nBq6K/10_panel_std_test_at_home.pdfIn PDF document text
    • http://trend-sales.fun/gafubawozisofijamobatufobx4ssv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitasixan.atwebpages.com/84542635934.pdfIn PDF document text
    • http://bimitev.epizy.com/bewuramaxibuwotofumaf.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/55535632014.pdfIn PDF document text
    • http://rabuxudaxubaso.epizy.com/zelda_ocarina_of_time_n64_walkthrough.pdfIn PDF document text
    • http://lugaderova.epizy.com/stranded_wire_ampacity_chart.pdfIn PDF document text
    • http://lapobikajedive.rf.gd/bufferedimage_java_android.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_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 5028 bytes
SHA-256: 2aa3e2e060937b25ff2a98d857aa0bdfabd68ccf2ff02b07f9f7ac46c9f8cb51
font_01_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 10760 bytes
SHA-256: ad2ebab68764af39e30aaedc4e495cbfef8ad2db88fab8724ce36c3262df9840