Malicious PDF — malware analysis report

Static analysis result for SHA-256 772c0eb85f44c071…

MALICIOUS

PDF

66.9 KB Created: 2020-12-15 00:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f165d10a1aebc1e23334343ee5cc9a2b SHA-1: 7dd96bc4db368eb51ec1abb84be4d63ab0c0a33c SHA-256: 772c0eb85f44c07154aa40f80dac82bce56c26aaa4b1e235b01b0c24e6250d8b
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 benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://traffnew.ru/123?utm_term=what+do+good+readers+do+lesson', is flagged as unknown reputation and is likely the primary malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=what+do+good+readers+do+lesson PDF link annotation
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/xulatifuxi.pdfIn PDF document text
    • https://nonuvatemex.weebly.com/uploads/1/3/4/4/134443968/bogazewobesariz-lajowozolozesos-fajogipike-gudovuwakijuxil.pdfIn PDF document text
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/d8f305b1.pdfIn PDF document text
    • https://misiwutikamiba.weebly.com/uploads/1/3/4/6/134601431/26b7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb46985c-e0af-4c5b-938d-38a6ec8e39a5/wetitojax.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc726861c59a74bd98f103d/t/5fcf189f05f6f27807528e2c/1607407775752/kutofiwekibuwerifonuxoj.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/pajimosititopidekedom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54fb7403f5353fdb2d39b/t/5fc823d0d17d55300fa24b8a/1606951888546/wagifagu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ca4260f2895dc1e74bd4/t/5fc8188b46ef2e08cba7bc33/1606949004112/ww2_american_planes_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deda91c2-ae0d-4c54-838e-d6e2bc1d3025/estilo_de_vida_definicion_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c387ba8d-4331-4f59-98ba-51770f2f806c/92065007831.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54dfe3dfdd95b60f249af/t/5fcbc8cfa0b42e3566b117cf/1607190737043/fishing_clash_codes_2020_august.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/7831793835.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc339c8df132613bbccc541/t/5fc62eb7eaf37e3b646edf94/1606823607770/pumonovizejezoninikawesiz.pdfIn 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_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 5100 bytes
SHA-256: 13b7a8562e68dde98efda8eb382bcb0f03e080a2e9775b8672b26e0f0c0e3ee0
font_01_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 10248 bytes
SHA-256: eaadf1a602503f8438345d8c5da6381690ff466d8b34926dd607e76f37a9176b

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