Malicious PDF — malware analysis report

Static analysis result for SHA-256 56191822cb42413b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-13 16:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bb6c8de7922b3e500918f60b723452c1 SHA-1: 90fdd3dce2b8ddb91d10e937addc65ee69ccfc04 SHA-256: 56191822cb42413ba46c0f53802edf9f89da06f452aa41c2453ad0627c024657
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://jumiwimov.ru/aws?utm_term=ranger%2527s+apprentice+pdf+book+12 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5ff96d2b9a88a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_603bd5a595de4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_603ab374155b6.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/bwakila_video_mp4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5ff96f5560ffd.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/ribowexulo/graphing_exponential_functions_worksheet.pdfIn PDF document text
    • http://jebebubijegew.rf.gd/gobevelakibedenazasene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7987b7-a323-4eb6-b85e-14d254decb48/weekly_weight_loss_tracker_template_instagram_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01cae410-2501-4f05-925b-6a8088c1bd0b/what_kind_of_intermolecular_forces_are_present_in_h2o.pdfIn PDF document text
    • http://wojodiguf.rf.gd/zakelofumu.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/is_linksys_n600_good_for_gaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3301a6c3-565d-4346-86fa-961cf01d8254/pabetukuvavafalav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cdaa97-bca3-49cf-82b5-305a6cf8fce4/54847141192.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/86419961067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9325d1fe-302c-4dc3-a65a-bdd10200a165/bidujejuwuwesi.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/58883882990.pdfIn PDF document text
    • http://judimavazamo.epizy.com/zte_z222_sim_card_size.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/natural_ways_to_pop_a_boil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1522fa6e-3132-43f8-a68a-541e275ec4ec/how_to_disassemble_a_whirlpool_oven.pdfIn PDF document text
    • http://pebejokepekizuz.rf.gd/corvette_c3_buyers_guide.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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 5720 bytes
SHA-256: e54458b62de0b9c636f4d9f63e26f4ca699ae4ce6bea7157a5ff6b407b926b94
font_01_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 10856 bytes
SHA-256: c19e788c4f5694efbacd8f4987cc21bfd0badcaadd3fea5cfdf706a0250827c6

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