Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec878881866099c…

MALICIOUS

PDF

91.8 KB Created: 2021-03-31 20:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c1454e5d68d87e19d999dc6027195e31 SHA-1: 0cd51390cf10c7e2662e148e28b7339dd42597b3 SHA-256: dec878881866099c596d642a3364e60bd8f237f7e06adffd937e5a559d70fe8e
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, suggests a lure related to 'Round tailed ground squirrel diet', likely a pretext to disguise the malicious intent of the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=round+tailed+ground+squirrel+diet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5fc5c1afe241e.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/guia_autometrica_abril_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_60468b8edf1c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476601/normal_5fffc9e8c7e6c.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/jiiajfd/playing_card_deck_box.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_60584fbdb2ff1.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/OLEhijd/washington_hockey_roster.pdfIn PDF document text
    • http://dedezitomurepu.iblogger.org/woduvagagasutulo.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/igjfOgj/jetaxagebakanegoris.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://lolunoxij.myartsonline.com/the_new_artisan_bread_in_five_minutes_a_day.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_1bc9fed72c0342268304290e7de250a3.pdf?index=trueIn PDF document text
    • http://merojupamen.epizy.com/atlas_map_of_world_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/birurowodifiwujivujepopa.pdfIn PDF document text
    • http://tavawefojob.epizy.com/cisco_anyconnect_4._6_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/gekasolefedajuzobu.pdfIn PDF document text
    • http://sisunef.epizy.com/53685490068.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_0571bcdceead4cc7a6585088fa04333f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/mojowanoxo.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_7b7ebb7272174d0a812e8d4ef3b16507.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_0a0d0d8ec81042eb84025ffbb5114d3d.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_588bef6231074c769c310089473ab331.pdf?index=trueIn PDF document text
    • http://jofarasaxorepow.rf.gd/20445146371.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/86498074894.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 5124 bytes
SHA-256: dabd09b21e45fed9d254696b63d268e0a46cf87be0f27fce6e90daab5646b71a
font_01_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 7876 bytes
SHA-256: 34c2141158bf375c1559dac29c911984946fb5f37a6f7e4f6e98b26bed65181a
font_02_sfnt_off00013bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF0 11016 bytes
SHA-256: fe50345c84b2c844d90c4574307d0e77132423b3ba92810979769afba59b4883