Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fe97351083145e…

MALICIOUS

PDF

70.6 KB Created: 2021-02-14 23:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1a5a355a139a17ad77ed432cc2595056 SHA-1: abebeb591504b80cdc01b99d04bf515ef89ca374 SHA-256: a4fe97351083145e584d3254495ebc0db510700691048588bf73ecc1c38925af
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains multiple embedded URLs, including one pointing to 'grinallex.shop', which is identified as a link farm on disposable hosting. The PDF's structure and embedded links suggest it is used as a lure to direct users to potentially malicious sites, consistent with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=energy+conservation+activity+worksheet PDF link annotation
    • http://grinallex.shop/broken_age_ipa7row1.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/bihcibZ/review_game_f1_2016_android.pdfIn PDF document text
    • http://natiral.space/nails_done_hair_done_like_a_savagezrms3.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/Wifx9hc/live_streaming_apps_for_firestick.pdfIn PDF document text
    • https://falesejus.weebly.com/uploads/1/3/1/4/131483218/tigeguzulixaborobef.pdfIn PDF document text
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/setubofufara.pdfIn PDF document text
    • https://guwosifewutus.weebly.com/uploads/1/3/4/6/134616196/7545644.pdfIn PDF document text
    • https://sowekunozo.weebly.com/uploads/1/3/5/3/135321923/jugesekibafifed.pdfIn PDF document text
    • http://topsalon.xyz/ati_radeon_hd_3450_updatei785i.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/Riggfii/borejubupewu.pdfIn PDF document text
    • https://xutareziwax.weebly.com/uploads/1/3/5/3/135327408/4317123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lizuratudesaxop.epizy.com/cafeland_mod_free.pdfIn PDF document text
    • http://mogopubu.epizy.com/tenapofetekorok.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/trasformazione_libbre_chilogrammi.pdfIn PDF document text
    • http://xonifovozub.epizy.com/classroom_objects_printable_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/widawomanifi.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/airlift_song_likewap.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/2190894477.pdfIn PDF document text
    • http://pebimomedunuzux.epizy.com/1703555717.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/3015678141.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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 5304 bytes
SHA-256: a4a430df2f28244ce01f91ca7308009b3b04c2809b0d8abbd8de320b8f70ca7e
font_01_sfnt_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 10064 bytes
SHA-256: 948d0ce08d055a98a3b17c3086e79d5b39192c0458b751108d84fdd1091b30b2

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