Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d3684c63083b91…

MALICIOUS

PDF

69.6 KB Created: 2021-03-11 21:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fab11451eca54aa99224fb9d5ab47c1a SHA-1: ee3829586156a6c10cdf0f346c4e79b4f476a783 SHA-256: 35d3684c63083b9174a103b4572fb9e65032872de03c1e2bb0aaaa4ea0f6f1ef
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://maypoin.ru/123?utm_term=circus+cartoon+vector+free PDF link annotation
    • http://fasekafalig.scienceontheweb.net/nec_dt300_change_extension_name.pdfIn PDF document text
    • https://mifanalukuzesu.weebly.com/uploads/1/3/4/6/134688284/kinewi_nikapomozu_mupipufixi.pdfIn PDF document text
    • https://jajonugofetafis.weebly.com/uploads/1/3/0/7/130776034/somigafuxog.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/volume_of_cuboid_word_problems.pdfIn PDF document text
    • https://putigored.weebly.com/uploads/1/3/0/7/130738503/liwizalagomowojase.pdfIn PDF document text
    • https://povejuzulegaje.weebly.com/uploads/1/3/5/3/135301343/2691048.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/9b9d60c1ca.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/2818522626.pdfIn PDF document text
    • https://fofomakizu.weebly.com/uploads/1/3/0/7/130775640/61d7c.pdfIn PDF document text
    • https://podinelejuwe.weebly.com/uploads/1/3/2/7/132710627/3316507.pdfIn PDF document text
    • http://bisapusid.mypressonline.com/61072948587.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/mitog-tapemonogal.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/14d7bcfec1e.pdfIn PDF document text
    • http://witinub.iblogger.org/are_bodyweight_circuits_effective.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wetosevezobesof.rf.gd/aggregate_planning_in_supply_chain_management.pdfIn PDF document text
    • http://kisetifanuxutol.epizy.com/clavier_azerty_android_huawei.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_33ab2e29810c4c12b89b7af84c9588c7.pdf?index=trueIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/hunger_games_books_paperback.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_b3ce2b2b4eed44168743c26c9228197a.pdf?index=trueIn PDF document text
    • http://fabibupotiliba.epizy.com/blast_furnace_process_flow_chart.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_28c476761890486f9b2c172e3d721134.pdf?index=trueIn PDF document text
    • http://laxuzoto.onlinewebshop.net/20512942523.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_efece0df3a524c798d5e18f8f34d1fd9.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_79246fa7e7a1436093cd8c68e65505ba.pdf?index=trueIn PDF document text
    • http://pabadebaluke.rf.gd/65575596466.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 4808 bytes
SHA-256: d11e2ba641b049ed9451d9c845e4f285b237111414c192f708de7b80f8119876
font_01_sfnt_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 9716 bytes
SHA-256: fa97c4f4dd80edb5c6e509912ccd73c1dad9adb2a3085fc263f19847dbcc4136
font_02_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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