Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d998765bd8eaa4…

MALICIOUS

PDF

75.6 KB Created: 2021-04-08 21:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5519752fa91986b7b408306a7487864e SHA-1: 202e5a69102d5edc797f54174308e25cf6baacfd SHA-256: 84d998765bd8eaa4101b02aaf1d813ffde98b4e84230000954aa32ce1750d098
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure and SEO link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of exploiting user trust to lead them to malicious content.

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
  • 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/strik?utm_term=what+is+oxford+referencing+style In PDF document text
    • https://ginataxidorivez.weebly.com/uploads/1/3/4/0/134041929/6357025.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/gonurizadute.pdfIn PDF document text
    • https://gufulesem.weebly.com/uploads/1/3/4/6/134698375/31c39d09da096b.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/6d9ee54a3ddd.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/ansar_vdp_job_application_form_2020.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/daily_english_speaking_practice.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/chemistry_book_10_12.pdfIn PDF document text
    • http://tuzirawejaw.mypressonline.com/10930033743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodojes.epizy.com/radiance_of_azshara_tank_guide.pdfIn PDF document text
    • http://fukasutatota.rf.gd/attestation_formation_aux_premiers_secours.pdfIn PDF document text
    • http://dabavejutabumek.epizy.com/casio_fx_570es_plus_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/weekly_us_oil_inventory_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/dog_fursona_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/acknowledgement_sample_for_seminar_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/boxiv.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/33780676092.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/tozuwiz.pdfIn PDF document text
    • http://tugojolowok.epizy.com/ab_inbev_annual_report_2011.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/38893130705.pdfIn PDF document text
    • http://zatibesen.epizy.com/datuwupuvuzef.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/78205603518.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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 5464 bytes
SHA-256: 9b763049c65d0166bef9dd7aafe10af46be17b992a13832ca01e17d09c94070d
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 10964 bytes
SHA-256: 13239b132c55bf713fd6a04a235cf69ad5bd44a44444c59b84c85f167063f374