Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1870a79a27a740c…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 17:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ef0493e83ed98ab0d88a051e7f7f7373 SHA-1: 2df30eb16c4ddc69b1ed186bd8804d5c6430ac78 SHA-256: a1870a79a27a740cd9c19c808d13482cf367ed283f881371e686557f78a3cb69
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 0.9991

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://resalured.ru/wix?keyword=lewis+dot+diagram+worksheet+key PDF link annotation
    • http://labiosdewonda.com/67510819466a47w6.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/2011_dodge_avenger_heat_tire_size.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/miwizo.pdfIn PDF document text
    • http://naturaitalia.space/khan_academy_biology_worksheetsu4vgg.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/remedies_against_satans_devices.pdfIn PDF document text
    • http://vienvozvrat.site/7503890362ps5au.pdfIn PDF document text
    • https://cdn.sqhk.co/ninasodivofi/ggihja2/9492024287.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/questionnaire_to_measure_academic_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvavegipap/4heGMPf/75881258541.pdfIn PDF document text
    • http://vigikigopaloze.medianewsonline.com/wezedegokuwefox.pdfIn PDF document text
    • http://masajsalonunuz.com/what_is_a_faith_journeyyfnte.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf41afa7-a4be-44c4-93bd-ce79120461b1/81662539245.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_de58d8822fec4dee846e1f972e9a9659.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79cd9fb6-f9f5-4d24-9960-6a58bd983f11/clipart_heart_shape_free_download.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_11e8763f54bd4f5a826738dbc902c5f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/3338089097.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/88801684800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6ef139-5e1d-468b-8979-d4bcecbaea68/concept_chameleon_dvd_player.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/dosajosewuweneporopexu.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/bncc_ensino_fundamental_ii.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_b4277a4b8fb94fe1939bae89e8287519.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_1447c3193acc447380b67ec4caebe44c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/software_architecture_design_tools_open_source.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e49feb-0989-4ead-91a0-115929363f2b/how_to_reset_honeywell_thermostat_after_changing_batteries.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_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 5408 bytes
SHA-256: 8496d6a3743f4dc43f7d7156f2153e89bcf11cf1cd080d1ff97be52a0b50a92a
font_01_sfnt_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 10472 bytes
SHA-256: 8e19f0c4362e4940ba6a4cea655d4afdebded83c9c72dfc20df0a71b7d9f45d1

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