Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ddf80f432592db…

MALICIOUS

PDF

76.9 KB Created: 2021-03-30 04:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 34205910aab9b9ea5f07056cda37eb00 SHA-1: c7eaa393877093c44b3d6a11912dc72a050a02de SHA-256: b8ddf80f432592dbc055fb3f109b03108ecc39ce41c6c1bcf8dd2ac4944a4d86
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO redirectors designed to phish users or distribute malware. The primary redirector URL is `https://jottigo.ru/strik?utm_term=veterans+clothing+donation+drop+off+box+near+me`, which is presented as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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://jottigo.ru/strik?utm_term=veterans+clothing+donation+drop+off+box+near+me PDF link annotation
    • http://zovitidagawas.sportsontheweb.net/medical_medium_celery_juice_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489028/normal_5fccf4135b1b1.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/76490492114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378404/normal_5ffb5848604dd.pdfIn PDF document text
    • https://bopenuxot.weebly.com/uploads/1/3/4/6/134667357/8a735a66054.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/govakozumenal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405946/normal_5fee857f53513.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/getixarev-mojezezizugirax-wateseluzajeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5ffd45bcc7319.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/8651086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393486/normal_60626457c121c.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/fufabejitekuxos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_604aea7808b89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410447/normal_5ffc2b4a38422.pdfIn PDF document text
    • https://gevotasi.weebly.com/uploads/1/3/4/3/134389209/wozisukowudafawar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09443140-134f-41e2-bbd4-9a8566e5c007/68826804275.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_59a1e9f8b85542f8a9d381c9131b2b0e.pdf?index=trueIn PDF document text
    • http://rugefar.myartsonline.com/90848668541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8240047-17be-4db4-8adf-8a06a2fd5186/vocabulary_builder_activity.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_788941a8d5bb48dab4f1a852b7236ffd.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_970da44cba5e4e2eac6846840e44702f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b63cfb-ddc7-4cab-8d99-62e7349811f4/sejuvejifibapovimusaxu.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_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 5740 bytes
SHA-256: 284323184d3bb7b53c2d63c125cc3d1c273e20c6f3e538a8f57a538651cb72ca
font_01_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 10324 bytes
SHA-256: c5dd870e60ac86918bdc923f772ab67500a82bc47b0d3d08ae017d392bf91358