Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e97f0058aee2ac…

MALICIOUS

PDF

79.8 KB Created: 2021-03-21 04:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 957a90352e13be48ef152a59f4b72c47 SHA-1: 360105d01d11ae2218a3b775cb4cd8f96761c1c3 SHA-256: c9e97f0058aee2ac6cb1aee46d51950c031406d68625f46bd7712a8939470453
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and link farm behavior point to malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://vilenefex.ru/wix?keyword=pathfinder+2e+cleric+feats PDF link annotation
    • https://degijidugaf.weebly.com/uploads/1/3/4/8/134886203/fateloxuxekizopuzuf.pdfIn PDF document text
    • https://gilepinewuje.weebly.com/uploads/1/3/4/0/134096317/6812434.pdfIn PDF document text
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/e25b4d.pdfIn PDF document text
    • https://taboxataxenigo.weebly.com/uploads/1/3/4/1/134108556/5347080.pdfIn PDF document text
    • http://xojopimo.22web.org/31875569271.pdfIn PDF document text
    • https://kefavemi.weebly.com/uploads/1/3/4/0/134042724/bazetamenofavuzuwe.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/39599c.pdfIn PDF document text
    • https://lobakazuperowe.weebly.com/uploads/1/3/4/3/134352895/nijipanugezuzes.pdfIn PDF document text
    • http://gosologesegob.iblogger.org/martial_artist_stretch_routine.pdfIn PDF document text
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/nanifebafukanekimoj.pdfIn PDF document text
    • http://ganutaragifak.22web.org/ti84_plus_ce_charger.pdfIn PDF document text
    • https://gipebikurowa.weebly.com/uploads/1/3/4/0/134095939/c472f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wakojemoxu.rf.gd/grimoire_meaning_black_clover.pdfIn PDF document text
    • http://kimibixapi.epizy.com/99914547167.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_9fcf0b65e88a423d8c9a512eac67a62d.pdf?index=trueIn PDF document text
    • http://josekew.epizy.com/24043465419.pdfIn PDF document text
    • http://remobufu.rf.gd/85528079744.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_017a986dc8b44f57bffffd6d0faed364.pdf?index=trueIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_db803ca632a1420cb03151411a32d01b.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_5bc5b3d2a46547d9baa326176bbcc2d7.pdf?index=trueIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_07d85813046b46479ff79cbe7c298ffd.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_6b26f704d50d47b8a893c8dbc43a5646.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_ca5ddb64781444b28b23072ef844e5e9.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_15032a3176504bd0a9cf861920513cfe.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 5240 bytes
SHA-256: 9c77f03aeeb21966753230a35e1dc3cbff57481c86f10fe8e1b8c9cdabf37e1e
font_01_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 10288 bytes
SHA-256: 8a9c133f820e9747d854926f069359c1f4cf74f14013fcd2e504dea1866bde31

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