Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac260f299c40138…

MALICIOUS

PDF

77.7 KB Created: 2021-05-01 18:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1efc1d751ca795eb01c5ee0412f4605c SHA-1: 1693c1b2d4cc3d492abbadcb16bf06374fe045ec SHA-256: fac260f299c4013884266b623ed5d77e97b2a0dae7391bb365d7cd885e67938e
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 0.9999

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/strik?utm_term=ipod+nano+7th+generation+has+bluetooth PDF link annotation
    • http://vertitribe.store/caloric_prestige_series_oven_manual05mlg.pdfIn PDF document text
    • http://nozudozaki.22web.org/rock_band_4_ps4_drumset.pdfIn PDF document text
    • http://podeves.xyz/14535115083c20f6.pdfIn PDF document text
    • https://domokozojitapa.weebly.com/uploads/1/3/4/2/134235183/fuzenozizarofe-zijawa-nidulitilejudi.pdfIn PDF document text
    • http://wiruribadusa.iblogger.org/sharkk_boombox_speaker_manual.pdfIn PDF document text
    • http://kemytbok.xyz/how_to_service_lg_air_conditionerp71ri.pdfIn PDF document text
    • http://zijiwox.iblogger.org/37481363660.pdfIn PDF document text
    • http://sweetmeet.online/how_much_to_replace_all_floor_joistsp8ch8.pdfIn PDF document text
    • https://fekipasipoxow.weebly.com/uploads/1/3/1/6/131637207/3430370.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/d875f9cf-18c3-46ef-a378-bd11101a5793/kabaviso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f887a587-43a6-4a8b-bf2e-9bc7ad2cedca/3100016451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1156c8ff-ce1a-48a9-a035-859186b6f0c0/61550271083.pdfIn PDF document text
    • http://nuvitaros.epizy.com/88831268606.pdfIn PDF document text
    • http://roxegubipav.epizy.com/1929852690.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_45a56b46e88e47caad49d4a17bd04b69.pdf?index=trueIn PDF document text
    • https://0816b8db-db6e-4af9-a106-1766ff0f8d73.filesusr.com/ugd/06e6c8_7c5b2fa9257c480ba68cb1e8274a789a.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_d2abd1394b004ca1a060179e237fc826.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_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 5380 bytes
SHA-256: 795218e874f866a5e945d72463f212e393fce986d606aa1f458ba303b1ef74c4
font_01_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 11104 bytes
SHA-256: 9f052fdbf1682280091c42d968aa92c0f489e5a5ec6adf5a57ec48fe88a5cf2a

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