Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3de4c3584c4fc2…

MALICIOUS

PDF

77.9 KB Created: 2021-03-19 23:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1407e8af6038e8f67846bc86aed88519 SHA-1: 198e637133973a7110e7af489aa9e1e5386187d6 SHA-256: ca3de4c3584c4fc2ee312a998518764c88f708e4573351dafc9b0fb06f141b81
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary external URL, https://zajinet.ru/strik?utm_term=john+deere+48c+mower+deck+belt+size, is likely part of this scheme to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=john+deere+48c+mower+deck+belt+size
    • http://omerkatanalp.com/sundarakanda_in_tamilxwduc.pdf
    • http://rankingcoach-apps.com/jisagisesixukizareljr6qv.pdf
    • https://cdn.sqhk.co/fenazijeguk/ebiaKaK/limobitigemiremezuleziwaf.pdf
    • https://cdn.sqhk.co/kifukuvitog/haqM2RI/71460378118.pdf
    • http://organic-ita.space/35721212138uag91.pdf
    • http://pivadelutarape.iblogger.org/write_equations_of_lines_in_slope-intercept_form_worksheet.pdf
    • http://lidobexi.22web.org/equivalent_fractions_worksheet_ks4.pdf
    • http://tajezedireg.iblogger.org/pobuditaw.pdf
    • https://cdn.sqhk.co/moviferu/1gdjdia/baby_s_first_words_barefoot_books.pdf
    • https://cdn.sqhk.co/bajafigotuvi/s8IaGgi/oregon_wildfire_evacuation_map_live.pdf
    • http://fakaripeti.xyz/are_there_miniature_german_shepherdsr3ynt.pdf
    • https://cdn.sqhk.co/tupipitijil/aWhyiba/cube_crash_online_game.pdf
    • http://bufo.online/sap_tutorial_for_beginnersg62w9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_95e54b2485544c11a0061d435b1af578.pdf?index=true
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_f4fc2fe4ffb24b119d713306234f1917.pdf?index=true
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_f6e3090f72024e308e0d7233815bd489.pdf?index=true
    • https://uploads.strikinglycdn.com/files/247cea12-435d-4f0b-aa5f-12826ea2bd66/51171977560.pdf
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_53c4a8ab2f564105b7d95d1c4b8970c2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/47df842b-1125-44c7-98c6-8461604c7469/bipixatapifojinetinowe.pdf
    • http://vagaxalelevirot.epizy.com/78709661291.pdf
    • https://7915b8bc-6246-4d41-ad24-d7282f9ec2d3.filesusr.com/ugd/3bcfef_95e3d700f90a483395e55056dd254a5f.pdf?index=true
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_52dcfe90f0c54d7dbd6de157f4a6da5f.pdf?index=true
    • http://libunemep.epizy.com/jawapofefoneti.pdf
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_2f89b7ee871549dc86623b6a682f69e9.pdf?index=true
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_fcc3e9dddf0441b2bff8f5192cc5b34d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2e48dda2-6646-491a-9515-14c9124782bb/negebokinogadabukede.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e2.bin
65e89105d19f6b1866f45177e579878ef713c0772a6a3cb72802fcc86547dcb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 5584 bytes
font_01_sfnt_off000103d7.bin
2f7ee182256f911467ccfc827211851e1008c152043f3c8960b0ecc4a14480cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 11128 bytes