Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4098a2fea306a1a…

MALICIOUS

PDF

80.0 KB Created: 2021-03-14 10:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dd578f845cde4be07edfdc1af11b25e7 SHA-1: 6242f434af2a261a18df52c1471f0ed32907d32e SHA-256: d4098a2fea306a1abeb77ddb3a16bafa67ba49d5ec4cce14243a88c0ce3ee4b4
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://druttle.ru/wix?keyword=vulpin+adventure+elements PDF link annotation
    • http://remontlegko.info/wenakiwevb2sz.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/jj5iiJU/gutogamivekubug.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/waxabom.pdfIn PDF document text
    • http://verification-help.com/nutritional_information_fully_cooked_bacon43ynb.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/47220153402.pdfIn PDF document text
    • http://tujubiluwanodof.22web.org/joseph_campbell_influence_on_star_wars.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/761285.pdfIn PDF document text
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/2b76958b4ab0.pdfIn PDF document text
    • http://life50it.pro/wasuremonamhto1q.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/59238034095.pdfIn PDF document text
    • https://cdn.sqhk.co/mesodimeduje/gcakoYY/zobujedowagepufav.pdfIn PDF document text
    • http://dabosesavedevet.medianewsonline.com/xidikunawudefifojowa.pdfIn PDF document text
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/tabovot.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/sodowubeboxakok.pdfIn PDF document text
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/5332105.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/hjjfibF/nashville_smart_start.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/1gfyKVN/41226988169.pdfIn PDF document text
    • https://cdn.sqhk.co/rijujonakuje/ehdtSx0/25163996344.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/sukitukojago-zibagizemag-kekovubif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_0b39fb2d0b61499097035519de789049.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_ca8f17a784ec4f1d98cfc4ed053092d2.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_9e902d69ba734e5faa336585a04b297e.pdf?index=trueIn PDF document text
    • http://vovuxofeli.rf.gd/battletech_cartoon_stream.pdfIn PDF document text
    • http://jalawiwutuku.epizy.com/brother_label_maker_model_pt-1290.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_5b724923d3534340afa381b18a184820.pdf?index=trueIn PDF document text
    • http://dafevuzadolax.epizy.com/besharam_movie_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 4904 bytes
SHA-256: 541734b51be14bdcdf888a404cbd5bd7848324e3b96b7083807455cfce876087
font_01_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 10344 bytes
SHA-256: 9ee9c7d9e443160bb90d64a4e771a75c5912282dcdf5dcd409cd5cedf8083cb2
font_02_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c