Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7ce73d9562ac50…

MALICIOUS

PDF

78.2 KB Created: 2021-03-08 23:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6b0db1b1a79f40abbf415ea93fdd5254 SHA-1: 94ff6e9a008f872beaac72b33b51c8839716d8e4 SHA-256: 9b7ce73d9562ac507d677d4f7bcb37cfcb7abe39cc5e0318c014271f3e4290be
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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/strik?utm_term=why+human+experimentation+is+important PDF link annotation
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/senagi-gafovalexo-bofavudewif.pdfIn PDF document text
    • https://dawejiji.weebly.com/uploads/1/3/4/5/134505451/ec81068f59bcdc.pdfIn PDF document text
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/sozujil_zekibidofowibon.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/dfdfd1d3ff8945f.pdfIn PDF document text
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/8842320.pdfIn PDF document text
    • https://xosebabonewita.weebly.com/uploads/1/3/4/6/134613761/fowadim-zenodet.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/xiteleloresafijodole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/education_queensland_lesson_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/minecraft_skins_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a7843b7-1c87-420a-9011-87ec0cf5a574/how_to_cite_an_online_magazine_article_in_apa_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad990d3-42f3-4241-8051-fa3f7476f9fa/53444207648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee46dec-07d4-40e4-8055-36793f97f774/hm_digital_marketing_strategy.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/global_gender_gap_report_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/update_chrome_on_android_device.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/asphalt_9_ios_and_android_multiplayer.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_26b376cae6174630b44bff83af60da2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadere/74292492528.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/arduino_uno_r3_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/basic_english_learning_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/9582635937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af54c8af-5e9e-4092-92b2-a3b8be1170f9/97728884485.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_6871b1d9d37842b19a44e627dc2d58c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/19533742634.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_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 5212 bytes
SHA-256: 32ccf3f67228771c85e17066962090a29269c4700158744522fa969412514da2
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 10780 bytes
SHA-256: 7243d30b1ef38316b39a34483c66285cc77cc6641db536ea59c5cfc8df404f8f

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