Malicious PDF — malware analysis report

Static analysis result for SHA-256 13edcfee0eb6511e…

MALICIOUS

PDF

68.4 KB Created: 2021-02-10 17:27:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 15a17b4e91d0466770dac87353dc8abc SHA-1: 22b7c8cdd2b3b4f66a759bb50284fdc647b2e38f SHA-256: 13edcfee0eb6511e04939983c8001147e333c19c11af8d91e2da9a7ec42b8cc4
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for a game download, which is a common social engineering tactic. The ML classifier and ClamAV detection further support the malicious nature of this file.

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
  • 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/123?utm_term=2028+undertale+unblocked+download In PDF document text
    • https://cdn.sqhk.co/mozoposowi/hiq5oNb/xotax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fe5d6d88f3eb.pdfIn PDF document text
    • http://delayikapy.xyz/infected_ear_cartilage_piercing_antibiotics2o3v4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5ff9f6cb2e4b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fdf2444a0a9c.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/hjhidY7/wits_mining_engineering_short_courses.pdfIn PDF document text
    • http://storeeu.info/efootball_pes_2021_instant_gamingw9t4f.pdfIn PDF document text
    • http://parrrtner.xyz/gefipagoluwifosowulafuni4r3q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_600d098d33299.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/G7Riil2/instagram_follower_increasing_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_5fdbb8176a029.pdfIn PDF document text
    • http://vorecan.space/75175118690cc2lr.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/7iagdgd/recreated_zx_spectrum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd8caed0810d.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/iOSZiDd/invaluable_synonyms_power_thesaurus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486983/normal_5fcced6ca10b4.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/yGLFhbl/tangled_the_series_varian_and_cassandra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nefagolom/human_rogue_leveling_guide_wow_classic.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000bdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB6 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000cdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAA 5424 bytes
SHA-256: 92a305e5f2a2c7a4011d9ef33b17bbacf24c11431bb321c1ad48206f7e631cf1
font_02_sfnt_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 10436 bytes
SHA-256: 8756e4c934bc3fe67b3362a1227b62fb2736a851f9e0f0493aefe25a6fda9d5c

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