Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0f7d9570c3f4ed…

MALICIOUS

PDF

78.9 KB Created: 2021-04-02 14:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5a122d5c45db638e5861e620d5bcf405 SHA-1: a858b293f29dedbe05e20956ac74f8f38d7e685a SHA-256: 1a0f7d9570c3f4ed47335d31c1bd254d56fbd812af6856755212716cfa98a78b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pelibifir.ru/award?keyword=opposite+adjectives+games+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366027/normal_6047f21c02c9f.pdfIn PDF document text
    • http://yandex-delivery.cc/somewhere_over_the_rainbow_chords_guitar_clapton4p43i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_60188b9dece99.pdfIn PDF document text
    • http://getcreditcheck.info/how_to_change_omron_mc_246_thermometer_from_celsius_to_fahrenheitmio2s.pdfIn PDF document text
    • http://presente-top.store/flysky_fs-i6_receiver_voltagek622x.pdfIn PDF document text
    • http://topchambre.xyz/why_is_my_asus_laptop_battery_not_charging8s964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480745/normal_5fe9a1f32d972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459922/normal_6021c21b319db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478133/normal_5ff7acd88ed15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fc5f8f6b5d35.pdfIn PDF document text
    • http://hookup157.online/empower_c1_download2zwp6.pdfIn PDF document text
    • http://hopecommunitynaz.com/53266587701tlt2b.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/analyzing_amino_acid_sequences_to_determine_evolutionary_relationships_worksheet_answersbi1uh.pdfIn PDF document text
    • http://www19216801.site/80097062913mrf4e.pdfIn PDF document text
    • http://how2clever.com/wavugixovodsc0w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449614/normal_5fdd0c0e8b97e.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/774bc9a4-480a-43e5-b616-81564f2af256/what_to_do_with_arduino_starter_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657a2ac7-26bb-44a1-aa78-5e5744347ea5/adobe_premiere_pro_cc_2020_transitions_pack_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ff6965-c139-479f-9d13-fc17dc822dcf/2019_ford_mustang_gt_premium_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ec715a-0428-4548-9b0a-64d12f18eeb0/how_to_use_a_charcoal_vertical_smoker.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_81e2c0c2b63c4df8b4f09573f6409876.pdf?index=trueIn PDF document text
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_8281e102a0604ddd830f16bb1ca0dea4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13622d73-1ffa-414a-8999-e4f2041c1eda/2006_honda_rancher_350_oil_filter_part_number.pdfIn PDF document text
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_dfd42b37b3bc4c66aae5cb2c70c43c5d.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_3b093fdd9d9a4013adfe516544810898.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_12a53de9c2eb40538f853bae0ba85de0.pdf?index=trueIn 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_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5512 bytes
SHA-256: 7a30101490fd29eb4b6230c1ea5df9e9fb63911885da4fd5f2352837e46bbe8a
font_01_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 11472 bytes
SHA-256: 467c76b77196b76902e5b60c149eab2219eb07f9d7dbfc8e9090743dd997acfe