Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57550a33a1aecc8…

MALICIOUS

PDF

75.2 KB Created: 2021-01-06 09:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 63dc3749c3d448ac94578ab47b118935 SHA-1: cded153fa845baf0e4ed143ca7a2581953a5f3a1 SHA-256: d57550a33a1aecc849e27fe63f8c32579df8031013511a34fad7e03b4b70422f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly those pointing to Weebly and Amazon S3, suggests an attempt to create a link farm or distribute further malicious content. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafficel.ru/aws?utm_term=define+collective+agreement+pdf PDF link annotation
    • https://vefesipawadupo.weebly.com/uploads/1/3/4/7/134746991/0012b00ed45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fca28768246e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5fc48990a7edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fbf3e6659300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5fb74a749f068.pdfIn PDF document text
    • https://gobuxasab.weebly.com/uploads/1/3/4/6/134608876/fezefaxib-tofitineboruj-jukufepisugux-bulavegorob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410730/normal_5fe40c021ff5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5fb403ac1305f.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/ahc4k8l/high_speed_race_racing_need.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_5fd1d004563eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuxutedi/merelefanemazuzuxipevifiv.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/honorable_meaning_short_form.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/81664620186.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 5144 bytes
SHA-256: a4cf979863bc13c279ecf10fa5274ee29f05f1aacd5b14b8e2146a61e7f0fba7
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 11756 bytes
SHA-256: 5fab85010f48f21622d6e31bfb3c325967fc0dbc2bdb38b589245e500ed75c8c
font_02_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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