Malicious PDF — malware analysis report

Static analysis result for SHA-256 1607c6b0e36dfdf1…

MALICIOUS

PDF

74.3 KB Created: 2021-06-11 00:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d4c7642de52c3304979aa4f79052d80a SHA-1: b55bab1d830efaf6774a477838489da429f5ce8e SHA-256: 1607c6b0e36dfdf15f70c6b42a34ab01573d86bf391d7760eb52b1aa33ae2fae
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI points to 'https://irlanc.ru/pbw?utm_term=knife+making+lessons+near+me', suggesting a lure to a potentially malicious website. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/pbw?utm_term=knife+making+lessons+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484821/normal_605261d4d3265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_606557d50c7e6.pdfIn PDF document text
    • https://diritirafimiwav.weebly.com/uploads/1/3/4/3/134376035/8216783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_6041646258853.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465565/normal_60b66dffd733d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4495393/normal_60b70233066f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_5fdd6c3b167e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_5fd95c2cd02fb.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/51c575.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/46381d7d-988a-4d95-b3cb-b787a529a770/mijenol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b2dd24-e426-4bb3-a51f-c2f1930dd5a8/how_to_train_your_dragon_2_characters_watch_the_movie_fanfiction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38614c7-af8e-4817-a0aa-a5cbb470bb6e/topegozebejol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc55e4dd-c95f-4685-9a36-b8470ff6290e/ipod_portable_speakers_and_docking_station.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af291ed8-b7e2-4377-a93b-ef8e8fea7c4c/way_of_the_five_elements_monk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9db6325-af02-4216-aa37-cd71c8edcf55/54309016322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09ca8e6-2b19-4939-bd80-995d1aa7ef65/dalixaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906c02e6-864b-4208-a26f-7c9c8f481f4b/82015019209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38036b25-df0c-422f-a846-b71305d02dee/lct_208cc_engine_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d275aa40-6c4c-4325-92bd-c1a98372b62e/card_college_light_review.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_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 5120 bytes
SHA-256: ef7c19200256048e5103d8a64e8101be29f498b9b72930bb55016ba612e1d19a
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 10492 bytes
SHA-256: 9ee60cbf52a766cbf695a32bd204771c5a94d60af4d3ffc75d7efc33acbcb819

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