Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d10b9b5bed6beeb…

MALICIOUS

PDF

81.5 KB Created: 2021-05-06 00:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 07e271c5e874d1707d3247e76b570d69 SHA-1: 229c3cb9a985f99f22c64537c2b54cca7bf368f7 SHA-256: 3d10b9b5bed6beeb33ec0659bcef503a234e48a8510c798f0da0a1d61c1fd619
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=how+to+install+optimum+modem PDF link annotation
    • https://zabagogaj.weebly.com/uploads/1/3/5/3/135313674/muvudut-jogujodapa-zetuzurubofemum.pdfIn PDF document text
    • https://pigulanofalo.weebly.com/uploads/1/3/1/4/131406379/db343d7.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/pixaj.pdfIn PDF document text
    • https://dawawasokiju.weebly.com/uploads/1/3/1/4/131408838/3648223.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/zeramedaxevugi.pdfIn PDF document text
    • http://matcobzor.ru/why_is_my_dyson_not_charginghznqz.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/pizufi-pabedenux-fobevifuw-mumusikatiruvim.pdfIn PDF document text
    • http://copyrightnotices-form.com/how_many_bags_can_you_take_on_allegiant_air36pll.pdfIn PDF document text
    • https://tugoxovelosiju.weebly.com/uploads/1/3/0/9/130969774/sasufafek_lugivamok_xedazifom_japadix.pdfIn PDF document text
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/vekejarizezevet_jawuzovapu_joguxopexalig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_d19b192ce4a9438b91b64ccab94f048e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/75382424189.pdfIn PDF document text
    • http://fixedarutagovun.rf.gd/woxagewijulawuvovizem.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_f0d0dae6721348a99513b875926198fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/temuwifes.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_0fa86a430e374605be08cf7ab3abf9a6.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_79215053771541d0b8bb3113356a6116.pdf?index=trueIn PDF document text
    • http://koviwuwe.epizy.com/nowakakiteduxikeguto.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/getting_blood_out_of_white_bed_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/game_show_background_template.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_bbe69a10bfe743fc8e363b9fd7c68114.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 6812 bytes
SHA-256: 2e0ee37cd64f4c35472631c058407906ad20f0781d2500579fe3f45af03c2431
font_01_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 5060 bytes
SHA-256: 70aff30f4900a4e97cbdc44be7930d6b004c0d4453b64eb57d8a90967c10f736
font_02_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 11448 bytes
SHA-256: be09edc167306a28027b4587b97fddb85f7a239ac8307948b4bae773ecb31881

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