Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a942ee14102d8f7…

MALICIOUS

PDF

97.2 KB Created: 2021-04-13 07:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cfc3592f1d61e2f4431f38d8c68d6c74 SHA-1: 945165925d6d73334c3c5cfeaa3e19a8930d2afd SHA-256: 7a942ee14102d8f768ec26a53d449e06d896d855cfe527179f7be79afdc9527c
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=how+much+is+a+remote+start+for+a+mazda+cx+5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410730/normal_602f3f6549ce3.pdfIn PDF document text
    • http://bukipumil.mypressonline.com/what_is_factless_fact_table_in_data_warehousing_with_example.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/zumirubujobuvikipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_60377446a87a1.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/if8MmsA/guzowekesifoduwopilen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_5fe30f1271d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_603722d3b4aca.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiziluda/gg8jeGh/90045108636.pdfIn PDF document text
    • https://cdn.sqhk.co/tawavumazo/iiherbm/wibumanamebinovaredusu.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/jaQFjbh/kejufelifupelinedenovemov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379234/normal_5ff7a1bd99ceb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fugufaza.myartsonline.com/aviation_english_teacher_s_book_chomikuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59422b38-056f-45d4-8d60-7e5690fdf46d/kebobobusedajiw.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/sepog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a4f3e8-0158-4871-b2ac-d8ba0d98c12b/94791385260.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/how_to_do_big_7_long_division.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780514a9-23ba-462b-96ed-981b3bfe7014/xotefinew.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/52414583968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecea3c98-26ab-4270-a3aa-d9a0e2c5e461/jadilab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7edec7a3-fb41-4493-add8-3ea4a56f78e9/krups_ice_cream_maker_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/listening_for_america_inside_the_great_american_songbook_from_gershwin_to_sondheim.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_off00013e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E58 5524 bytes
SHA-256: 49f3d96b0821905296f4a896e1db718e62c8383877be336942f12a01eb1d1889
font_01_sfnt_off0001511c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511C 11288 bytes
SHA-256: e4ac5cd212db5129167dca649f54a4f80e0129238297a2ce1b5a532d39e25839

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