Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb58c2aae70d6471…

MALICIOUS

PDF

76.4 KB Created: 2021-02-13 09:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 89480ba5e80e8476f6ca3728c434a7b2 SHA-1: 8f9db8bd3e09cc5643bc9d1b3440b1ecfc21022e SHA-256: fb58c2aae70d647115fa773535f75d5b2f3efb0898f9001aeb9e08698848dee9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many of which point to disposable hosting or known redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection further supports its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/wix?keyword=point+of+concurrency+example In PDF document text
    • https://cdn.sqhk.co/modajili/IziehaE/virtual_family_mom_simulator.pdfIn PDF document text
    • https://zolowokixo.weebly.com/uploads/1/3/0/7/130738875/vokiweladej_takimukum_tunepupos_najidepej.pdfIn PDF document text
    • https://bajawefigorega.weebly.com/uploads/1/3/5/3/135339811/c421f228.pdfIn PDF document text
    • https://nutarubanamu.weebly.com/uploads/1/3/4/5/134528768/a37dddee88a.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/vexodobijib.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/JXic3Gi/transmission_fluid_pump_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/luwukamuku/mwhhHhh/world_war_z_2_game.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/4322044.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/gawofeximok.pdfIn PDF document text
    • https://miruvogix.weebly.com/uploads/1/3/1/4/131408245/jasor.pdfIn PDF document text
    • https://xamikike.weebly.com/uploads/1/3/1/4/131406211/4188d.pdfIn PDF document text
    • http://teren.fun/molewenafujuvio4vxu.pdfIn PDF document text
    • http://onesmall.space/gonoluxipipoxotononfke84.pdfIn PDF document text
    • https://cdn.sqhk.co/toneribabut/jUF5wgi/40295979399.pdfIn PDF document text
    • https://dupazenulejafu.weebly.com/uploads/1/3/4/3/134331878/50b0ac059276c7f.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/NNgcWgh/hornblower_books_ranked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivuraxut.rf.gd/collage_maker_photo_app.pdfIn PDF document text
    • http://rekabalukog.rf.gd/1161989485.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/ios_game_center_on_android.pdfIn PDF document text
    • http://goziwofa.rf.gd/anaconda_full_movie_telugu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 5152 bytes
SHA-256: 9cc5ae4b84720f2582f7b466e611d0e744ccf02f328e8fea6081813991637769
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 9956 bytes
SHA-256: ee9ebef45fd16768329b690a1a8fe7ed6877bb7bcb7be9dcc350c7ce5cfb2416
font_02_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 16076 bytes
SHA-256: 6f31d8a09968cb758392806dff4ce0e2643fc3d6dc332c5b9fa07753cf63feee