Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff89490ce1c2879…

MALICIOUS

PDF

70.9 KB Created: 2020-11-26 17:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a1eb3909b2dc7ddf8a8a365e9701fd8 SHA-1: e94e84cac3506879f552d146d4a41e2627a3f7a4 SHA-256: 8ff89490ce1c28792f67487d80f9c2d56c42212335c940fded3ff59bbcbdbbae
222 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with critical heuristics identifying it as a redirector and part of a link farm. The document body, though heavily obfuscated, suggests a lure related to a 'printable worksheet'. The presence of multiple malicious links indicates an attempt to redirect the user to potentially harmful content, likely for downloading further malware. The ClamAV detection further supports its malicious nature.

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.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=printable+irregular+plural+nouns+worksheet
    • https://rufajesovulibo.weebly.com/uploads/1/3/4/2/134235528/witupiwulipojome.pdf
    • https://sugowula.weebly.com/uploads/1/3/4/6/134646485/21371.pdf
    • https://jeredesuju.weebly.com/uploads/1/3/4/4/134432205/951336.pdf
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/84deb81.pdf
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/5369802.pdf
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/dulebetidakirax-nefulo.pdf
    • https://gedevoliritigit.weebly.com/uploads/1/3/4/6/134686631/rediru.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7885719.pdf
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/wokazewuporejevux.pdf
    • https://wuriwodek.weebly.com/uploads/1/3/4/6/134688082/vojofav_letoxupusulu_nijugedigof.pdf
    • https://zazetafulunemu.weebly.com/uploads/1/3/4/5/134599809/velejilevoje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f0517a53-9c49-482d-9ef1-78923eb9ac97/62636092698.pdf
    • https://uploads.strikinglycdn.com/files/f77c8e39-4c48-4f2c-8663-ecda66c41943/65430643219.pdf
    • https://uploads.strikinglycdn.com/files/700cac22-2dc3-4a80-83e3-1549333142c9/cpcc_levine_campus.pdf
    • https://uploads.strikinglycdn.com/files/fa6d6f1b-b9de-4a16-ad0b-b5d01dcbea75/ark_recette_kibble.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cc.bin
d8759c4fda22bf5c1913c3586d6632e8e14b0411f5cb3e566a2315ee9d82894d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 5380 bytes
font_01_sfnt_off0000ea1f.bin
b046ef5144b4ce179b9d371f78317e413c1a015c295b6f35c5d8fc0adf1babc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 10708 bytes

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