Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc2747c5f3b461c…

MALICIOUS

PDF

74.6 KB Created: 2021-06-04 15:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4e015a6deed5b062e01300fd259e476 SHA-1: 56164b2d86462fcf9e7adfb8a1c1ca0ace4b830a SHA-256: bfc2747c5f3b461ccaaaf9891f8e44a3bd1b6bf26dd56f621d645b3d1a541633
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unknown or potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/pbw?utm_term=water+displacement+worksheet+doc
    • https://cdn-cms.f-static.net/uploads/4447630/normal_604d1f6acf5d3.pdf
    • https://bopewoxal.weebly.com/uploads/1/3/5/2/135296364/716afdc.pdf
    • https://cdn-cms.f-static.net/uploads/4427523/normal_6022dd86b00ed.pdf
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/5623009.pdf
    • https://gexuganogos.weebly.com/uploads/1/3/0/8/130813630/gipalesuj-silexi.pdf
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/gifofakirogojifana.pdf
    • https://xowiwive.weebly.com/uploads/1/3/1/3/131398234/jojibaku.pdf
    • https://pilazelade.weebly.com/uploads/1/3/5/3/135397465/zofasodojuwebarafafu.pdf
    • https://zizetorusiwewiw.weebly.com/uploads/1/3/5/9/135990502/mababuf.pdf
    • https://lotimameligibim.weebly.com/uploads/1/3/4/2/134235738/jokigor.pdf
    • https://cdn-cms.f-static.net/uploads/4485800/normal_60209aa2f2a03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eeb5aefb-b6ea-4286-8cc5-8d68f9313f18/north_carolina_road_test_requirements.pdf
    • https://uploads.strikinglycdn.com/files/8e1a9822-d2b3-4cb0-980e-fdec92770a76/dejalurufumaj.pdf
    • http://xumefosux.pbworks.com/f/33148675441.pdf
    • https://uploads.strikinglycdn.com/files/2f099d0d-f75b-4fcc-a16b-4710a5cafaeb/66011615081.pdf
    • https://uploads.strikinglycdn.com/files/9b91bc15-5c14-4456-a270-b20bcc9f1146/42013744162.pdf
    • https://uploads.strikinglycdn.com/files/66a4bc15-05c4-40de-8a6f-e18d52d7066a/acceptance_and_commitment_therapy_training_canada_2020.pdf
    • https://uploads.strikinglycdn.com/files/1dd560ea-1dc9-4f75-852f-039603dcf23c/frases_apropiadas_para_incluir_en_observaciones_de_boletas.pdf
    • http://gazoridixilu.pbworks.com/f/example_of_attendance_sheet_for_meeting.pdf
    • https://uploads.strikinglycdn.com/files/d040503e-60aa-42b8-adc7-0057586b5243/vexiboxo.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_off0000e327.bin
5a26cabaa27d5e9451cbeb0ee7992d38e1461cddd9606f7df1d29faa489dc27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 5480 bytes
font_01_sfnt_off0000f5bb.bin
589194782424db6a6e86ea18e813b1301b8a8ba020d673727b88876edc0a7f76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 10992 bytes

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