Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1a4d03cd913994…

MALICIOUS

PDF

76.6 KB Created: 2021-03-26 15:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8c7ee3ebca5facb614433c972c4fa037 SHA-1: 9837fbb19087948ecc3171f363847c265b7722c2 SHA-256: cc1a4d03cd913994fc1412c3ce09a24f6a7ebbb35af1021495d7192ea3f13073
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 0.9998

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://zajinet.ru/123?utm_term=ethos+pathos+and+logos+worksheet+answer+key PDF link annotation
    • https://xixezowipena.weebly.com/uploads/1/3/5/3/135341666/raridotu.pdfIn PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/likile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412387/normal_5fdcbb3e82a93.pdfIn PDF document text
    • http://strahuemsya.info/film_1anunnaki_sub_indop9jsu.pdfIn PDF document text
    • https://vakilelem.weebly.com/uploads/1/3/1/3/131379598/a730f.pdfIn PDF document text
    • http://thedefenseforge.com/68cra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417220/normal_60095a303de58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fd89a1934444.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/49294305261.pdfIn PDF document text
    • http://detonicro.website/jay-_z_vol._2._hard_knock_lifejq2fz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_5fd892922b064.pdfIn PDF document text
    • http://naturka.space/short_notes_on_shooting_an_elephant16790.pdfIn PDF document text
    • http://copyrightnotices-form.com/volca_sample_2_song_modeobbt4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_6039d38ed7e53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9de340-00d3-4b07-a168-ff0e43a62855/delonghi_ceramic_heater_good_guys.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/medicinal_chemistry_mcq_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a0621a-31be-4122-854f-acafd33a7631/effective_practices_in_early_childhood_education_building_a_foundation_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/format_of_descriptive_paragraph_class_9.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/87611062811.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_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 5436 bytes
SHA-256: 31f569a92a65a9a572bf56a3fb9b1294a6ca45df6ded8f182465b81e867473b2
font_01_sfnt_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 14852 bytes
SHA-256: ce403ed42c0ce2d6f59fcc2d945dbd6ac773cc53b447b256a44c809ad19a6251
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 4924 bytes
SHA-256: 2c0fd9671c8d4b6b7aa47225f826ac7e4b0621e5dbdd26942e58a35c69f4ee15

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