Malicious PDF — malware analysis report

Static analysis result for SHA-256 961aaa617db7a886…

MALICIOUS

PDF

70.9 KB Created: 2021-02-21 13:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 6447f9829c61ae4114378fbd622bddc3 SHA-1: 8e16418c1db2ebc94604763a9c58cabb8079a7e7 SHA-256: 961aaa617db7a886b8da1da8cf3c1b01968bd6d66a193f680d628c6982b14a1a
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=how+do+i+change+my+fitbit+charge+3+to+24+hour+clock In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403543/normal_5ff9622a0b910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5fe7d9df9842d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5fc7c6985b800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404740/normal_60000aaaccae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5fd848b600a2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367294/normal_60090b70586be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451950/normal_5ff633fa24b21.pdfIn PDF document text
    • https://fofavaduk.weebly.com/uploads/1/3/4/4/134436242/31134309.pdfIn PDF document text
    • https://larojebuwovu.weebly.com/uploads/1/3/1/3/131382373/79063cd.pdfIn PDF document text
    • https://wusaveverafojiz.weebly.com/uploads/1/3/4/3/134338410/4366065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/canon_rock_backing_track.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/temefovifubo.pdfIn PDF document text
    • http://mupamiposad.rf.gd/69225189513.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/vowunajij.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/82532869435.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/cash_flow_forecast_template_for_business_plan.pdfIn PDF document text
    • http://xevemifura.rf.gd/electrolyte_repletion_cheat_sheet.pdfIn PDF document text
    • http://jokipuzovorije.epizy.com/34044053440.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_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 6000 bytes
SHA-256: 2245fdb595471978ac70bab56cb4f0c65a7c19c2876be77622474b4c4dd91922
font_01_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 10724 bytes
SHA-256: 2ca67ac1f181422cf506ceb121086f96d133ef161b87d36083cccedddebc0c35