Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d76a41fa965d5d5…

MALICIOUS

PDF

73.6 KB Created: 2021-03-30 04:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b147092366d271df633723ceb24e821d SHA-1: 5b4c3dd60d0ded3cd1136f4b2f96ee0157b65e5c SHA-256: 5d76a41fa965d5d5d3267d747b8d2e1a41dbe5d75fbd71456a5c4a7418eebc51
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://baarspo.ru/award?keyword=certification+iso+14001+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443617/normal_6032a209c1733.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/5724361.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fc679cf0ceb9.pdfIn PDF document text
    • http://nokiwurugibub.mypressonline.com/egyptian_arabic_english_dictionary.pdfIn PDF document text
    • http://carishr.com/cch_to_sheet_trong_excelqf2e9.pdfIn PDF document text
    • http://nigasheff.xyz/verb_tense_definition_literatureiiyg3.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/hjghiHy/90237896888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420589/normal_5fedb9e421d11.pdfIn PDF document text
    • http://operationhomeplate.com/audio_joiner_program42k5k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374368/normal_5fc95e9ce0ccc.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/285d52002f.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuwatipo/1hiWXH1/crown_solitaire_a_new_puzzle_solitaire_card_game.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/how_to_set_mxr_10_band_eq.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/WRGjjyo/pifokokoreteguxi.pdfIn PDF document text
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/7845343.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/dozore/hp_8620_printhead_cleaning_kit.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/xopujifobufaf.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/68298079831.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/dasiwef.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/dofetefexalivogitaf.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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 5304 bytes
SHA-256: 9cb0f5dcc760172d4cdaef1c527909d131320ea92a1c8a36627a04050db62184
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 10340 bytes
SHA-256: 8c2fe484dd9de948c697b73b2a924f7ca402cdb019e05c59a11c1a92a567bef6

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