Malicious PDF — malware analysis report

Static analysis result for SHA-256 d364837644eef48b…

MALICIOUS

PDF

86.0 KB Created: 2021-04-03 20:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a9072ff70220daa24185b42286b1cb8 SHA-1: d131c629c54dda71ccdcca68d09d25bf57b0754f SHA-256: d364837644eef48b781efcaa23b0717368e1c707557b1cb1ddaaff7cc2032c0b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of the primary external links, 'https://resalured.ru/wix?keyword=proceso+de+ovogenesis+y+espermatogenesis+pdf', suggests a lure related to biological processes to attract traffic. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=proceso+de+ovogenesis+y+espermatogenesis+pdf
    • https://bifitulodagox.weebly.com/uploads/1/3/6/0/136081839/760bb761ca8e31.pdf
    • https://lipijunozawisek.weebly.com/uploads/1/3/4/7/134721324/vomafajer.pdf
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/826a5abbd260f.pdf
    • https://dapalaboz.weebly.com/uploads/1/3/0/8/130874192/581ec.pdf
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/f4275b23330d672.pdf
    • http://logusiba.22web.org/bivariate_normal.pdf
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/larokal-sakopavon-fezidorobi-dofenixajaw.pdf
    • http://wabuxon.iblogger.org/email_signature_rescue_templates.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mujevubutukoxu/fifudewap.pdf
    • http://fevunurinowigi.epizy.com/lareletof.pdf
    • https://uploads.strikinglycdn.com/files/7ba465f6-600d-4b25-81a8-eee5302e1a82/angles_formed_by_parallel_lines_cut_by_a_transversal_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/bd2f42f4-78b3-4809-b7ee-238272404a19/poulan_pro_20_inch_50cc_chainsaw_pp5020av.pdf
    • https://s3.amazonaws.com/faxaxos/annual_report_of_reliance_jio_2015-_16.pdf
    • http://mojilozijidula.epizy.com/deniluzesiloxunolizube.pdf
    • https://uploads.strikinglycdn.com/files/a013f223-59ca-401e-84d8-5b5468ebe636/bryant_plus_90_furnace_problems.pdf
    • https://s3.amazonaws.com/gagotaniwipure/dedibefirexi.pdf
    • https://s3.amazonaws.com/lolaritemukole/29862784842.pdf
    • https://s3.amazonaws.com/lupuvogotog/51572924740.pdf
    • https://uploads.strikinglycdn.com/files/def9fb9b-be3f-4423-9eba-1c8f2ab14308/94110711444.pdf
    • https://uploads.strikinglycdn.com/files/54c23aa9-6ca7-47ee-b34e-e98b1a329610/48108951675.pdf
    • https://uploads.strikinglycdn.com/files/cc124144-7951-4e13-9cbf-ac0f54a3b61e/casio_wk_500_power_supply.pdf
    • https://uploads.strikinglycdn.com/files/02a20b13-be77-438d-b5ba-ad1e50ebc886/senarubeg.pdf
    • http://badokelo.rf.gd/70605680442.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_off00010d62.bin
0d067bbb64e1dfdb72d9db2984f01e6c92f0b1d9885b1e97a33dba814b67359b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 5604 bytes
font_01_sfnt_off0001206d.bin
28e4bc54c6b8f2ccab294767093dc10300fed066692e7edcf510bfb3dd5411b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 12384 bytes