Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c8f12bdcb2f44d…

MALICIOUS

PDF

79.0 KB Created: 2021-03-27 23:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d510f639d584ba7ca8d33673269972f SHA-1: 22ed427349056bc65ac17ff3c08d12be973ccb94 SHA-256: 84c8f12bdcb2f44dccb2da2e87d76f694af212749fcb98d1bf33dfe59c63b641
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The document body, though partially corrupted, suggests a lure related to "Metabolismo de las proteinas pdf", which is used to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=metabolismo+de+las+proteinas+pdf
    • http://figimumagoko.mygamesonline.org/the_little_sas_book_6th_edition.pdf
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/1276944.pdf
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/eacd9.pdf
    • https://jefupijoban.weebly.com/uploads/1/3/1/4/131437873/tokilitanim-kenugakijoga-jegugofefa-mazelibabawamiz.pdf
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/5707844.pdf
    • http://mimivudarevi.scienceontheweb.net/word_to_converter_download_filehippo.pdf
    • https://static.s123-cdn-static.com/uploads/4449014/normal_60056223bd4a1.pdf
    • http://nituzovido.getenjoyment.net/kirugejim.pdf
    • https://xubivotalo.weebly.com/uploads/1/3/0/7/130775972/e6d47f.pdf
    • http://tezibif.mygamesonline.org/jirotekerorowatuzideb.pdf
    • https://cdn-cms.f-static.net/uploads/4383688/normal_6057d9164939c.pdf
    • http://vuwimoxit.mygamesonline.org/newusokevipokufup.pdf
    • https://duxezixupedad.weebly.com/uploads/1/3/4/0/134095883/buxofig.pdf
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/lexumaw.pdf
    • http://lulizukudomiz.scienceontheweb.net/south_african_history_books.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pixafur.atwebpages.com/banitexoxutitipajej.pdf
    • http://xiniwipilanaju.atwebpages.com/dabedofusepofinosepuvu.pdf
    • http://koxikid.epizy.com/nukalogewanekasofowimu.pdf
    • http://disejeninajexak.rf.gd/62701420263.pdf
    • http://fupuvafibip.rf.gd/67889804613.pdf
    • http://gojudupawoziwex.epizy.com/riwad.pdf
    • http://wisunomimat.epizy.com/lysogenic_cycle_of_bacteriophage.pdf
    • http://ledaruwevegoxu.onlinewebshop.net/aladdin_and_his_magic_lamp.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49f.bin
59f79528f17601563150c8c176b477faaedc966c06e2fc68e2e8ac720aceb733		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 5332 bytes
font_01_sfnt_off000106aa.bin
1673c41ca93072086a40c2f34f0374b8f729314b0908e85fa22345cb88a74978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 11688 bytes

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