Malicious PDF — malware analysis report

Static analysis result for SHA-256 988b9130059c4969…

MALICIOUS

PDF

107.8 KB Created: 2021-05-13 12:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 17918c84a061529e90ed7a99f354d595 SHA-1: 259658702cad32c77306c92580d5bae096b7352f SHA-256: 988b9130059c4969b9be2970c687f4349c391bce2817f7207a1d719ab3ace113
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://maypoin.ru/strik?utm_term=design+of+machine+elements+robert+l+norton PDF link annotation
    • https://cdn.sqhk.co/gutinisiv/idHPdtM/can_you_connect_copper_pipe_without_soldering.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5fdfa89c9f182.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/2hjmjf7/80358151594.pdfIn PDF document text
    • https://cdn.sqhk.co/tasaxasup/jgifnif/smashbox_halo_tinted_moisturizer_light.pdfIn PDF document text
    • http://igme.site/qualitative_analysis_of_lipids_lab_report3ba3n.pdfIn PDF document text
    • http://mscgis.net/zunilevixadatiloziwerid1nn0.pdfIn PDF document text
    • http://pressit.space/18631933851k7zk2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_6037c92ded15b.pdfIn PDF document text
    • http://paypallsecurity.com/maytag_bravos_dryer_parts_diagram51owk.pdfIn PDF document text
    • http://yewes.fun/550648730252k4pd.pdfIn PDF document text
    • http://douchehub.xyz/ribugikugnb5k.pdfIn PDF document text
    • http://ig-objectionform.com/what_act_is_the_mousetrap_in_hamletf22ur.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/KAgghgZ/sugovuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_55f603f77eab4bef8c570c1af573d406.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/romid.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/lovely_video_songs_free.pdfIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_be3fd00c1db64db5ade40fff7fb624a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/98824508333.pdfIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_b6e407a89f1048df8d8fa95cac9530ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajezife/63817558127.pdfIn PDF document text
    • https://bc881323-2374-4635-a2b7-f126f9929bd8.filesusr.com/ugd/546a35_49731a2b071147129ee43fb472483e60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/how_long_does_it_take_to_get_usps_tracking_information.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_85be3be29ca34af492fb37bdfaaba1cd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 36632 bytes
SHA-256: 919e478604de15a0550fa0c53d8dc2509421015d7b66b4a7a9c0546ee8802220
font_01_sfnt_off000167bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167BF 5436 bytes
SHA-256: 18d2a768c20b4ca22795fc638527e75bb78c0088149e5fa5a7c26d8dc8d1c932
font_02_sfnt_off00017a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A1B 11304 bytes
SHA-256: b14fd25f71a47cd6c5a480a4563ea763023547f9bd9dcdec53499a50fd1eb291