Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6733e6d63be0619…

MALICIOUS

PDF

76.3 KB Created: 2021-02-15 06:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b0ab219f6af03236cd6e466cf872e188 SHA-1: 2197843d842f520c5825fac8bbf2d889dca71219 SHA-256: f6733e6d63be061950365ca5cd118566b9a5c9fc961cae1b731ec2338a82a383
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of external links, forming a link farm hosted on disposable domains, with at least one URL redirecting to malicious infrastructure. The ML classifier and ClamAV also strongly indicated maliciousness, consistent with a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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=seesaw+family+app+apk In PDF document text
    • https://damuduwanilew.weebly.com/uploads/1/3/4/4/134477354/vuselafiduvijukadas.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/6e500a2ddf1d.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/vavawadifesokidipu.pdfIn PDF document text
    • https://fibarivinudew.weebly.com/uploads/1/3/5/3/135387866/mokub.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/cdf67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5ffa8bdc1e38a.pdfIn PDF document text
    • https://newimogo.weebly.com/uploads/1/3/1/0/131070302/wonazuwag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapomel.epizy.com/gonukimifenogofaw.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/biological_anthropology_stanford_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/8403208873.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/bloodhound_typeahead_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 5312 bytes
SHA-256: a50deed213ff2ca3660be88398a4fd76d6e5b05fc7d245d76c3753014a5f97ab
font_01_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 10792 bytes
SHA-256: 84532a6749bfc43aa029bc70b8716f7c32f821b1e1c8235228eaf04b48702c77
font_02_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 19564 bytes
SHA-256: 531c6b1885b9d56f569e32e52869ab1ecaf35fbcd76c9c122d069e5381712e9f

Open this report in the interactive analyzer, or submit your own file for analysis.