Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7798abc71773d16…

MALICIOUS

PDF

63.8 KB Created: 2020-11-24 21:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: be480419fc6570c079be6fbd530dc4ae SHA-1: 98261ecb2c7024d890748a510c6a8f237e2ca2de SHA-256: f7798abc71773d161021beaec2c5e8840cc382ecb10a508f73a1cc1de68132cf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure for a search tool, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/123?utm_term=buscador+de+personas+en+el+salvador PDF link annotation
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/gudamunajudokuxag.pdfIn PDF document text
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/7390141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f8b51d4704a2.pdfIn PDF document text
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/87edc41db9aaf08.pdfIn PDF document text
    • https://lakupemeza.weebly.com/uploads/1/3/4/2/134235705/febijexitujuwole.pdfIn PDF document text
    • https://danizodeker.weebly.com/uploads/1/3/4/5/134581754/5904692.pdfIn PDF document text
    • https://jazetixi.weebly.com/uploads/1/3/4/4/134494542/dubumufuru.pdfIn PDF document text
    • https://walupufodurutos.weebly.com/uploads/1/3/4/7/134734499/negabimezuxowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fad12123241d.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/vunizi/el_pulpo_restaurant_dallas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06aa91c-1d4b-4c3c-a0da-d9d50615c99d/winaridif.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/bot_arena_2_hacked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06412bf7-ce68-4a92-9a08-7c0b326cf2b5/47238859690.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/letter_c_worksheets_coloring.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/pomefigesulojexaxasosevu.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/how_to_make_a_pvc_train_whistle.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/jiromirafapewiniza.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/80487146341.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_off0000afe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE9 4928 bytes
SHA-256: 0e03f8f6d658f20f7ec83aa8239192e55b362ab8ec430fe29449964ad6344bfb
font_01_sfnt_off0000c0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AC 10244 bytes
SHA-256: aa5dad518c1e11650a227134815ccfaa4c9f5795c3762250c437c4ca8a26c295
font_02_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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