Malicious PDF — malware analysis report

Static analysis result for SHA-256 2443b88f22738cf1…

MALICIOUS

PDF

63.3 KB Created: 2020-12-17 12:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: edc5bb9c92b16a0d4fba6b990134b429 SHA-1: d11a7490ed941950cc786eb06fdc7a0eb9eb41bd SHA-256: 2443b88f22738cf138acbda762fc7ff9a1d409dbc4aa995957ee742bafa7e914
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically identifying a mass of external PDF links. The primary URL, 'https://trafffi.ru/strik?utm_term=fahrenheit+451+study+guide+pdf', suggests a lure related to a study guide, which is a common tactic 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://trafffi.ru/strik?utm_term=fahrenheit+451+study+guide+pdf PDF link annotation
    • https://taruwimogepumo.weebly.com/uploads/1/3/4/3/134331568/dad44d55.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/doxibitagubopuf.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/afe6d4f8c8cd.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/3d21f99.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/tajoxivagagugezevix.pdfIn PDF document text
    • https://lorovojiwu.weebly.com/uploads/1/3/4/3/134318747/12ef0a53515.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc55e3d239b0722914f125b/t/5fc924426e7c5350e33b4ce2/1607017539932/rope_rescue_unique_puzzle.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54d583398ff75154af26b/t/5fcb3f7626a2be7f6de15669/1607155574455/americanas_as_melhores_promocoes_da_internet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2aa47ab79f442f234e961/t/5fc503d7145a8629dc4ea0b7/1606747095599/spanish_verb_ir_to_go_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc789bb48c1673e559d6e31/t/5fd6cf37491a58544a22054a/1607913272202/dezobiniwizotudizizoje.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54deebd14ff0dd2b9c4c0/t/5fd1faa29a9e5443ac7ee0a4/1607596706738/automower_connect_apple_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/solfege_worksheet_1_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b71bf140fc3aa58b6189/t/5fc7fb0205c3f124b6079ad9/1606941443277/83272009982.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd18111f6a419847f67ca/t/5fcd88d65177ea328cdad873/1607305431123/nature_sounds_apple_music.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_off0000bc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC52 5592 bytes
SHA-256: 30c16cb7d597adcaab1beba0e8c7a51a99b131d54b15ff83653fdba32a6d4b0d
font_01_sfnt_off0000cf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 9760 bytes
SHA-256: 110adf3a768506f8f6e585af0810a54e59ef8f9db5169df7a3412f059d6a7c0c

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