Malicious PDF — malware analysis report

Static analysis result for SHA-256 884475cc68101ceb…

MALICIOUS

PDF

90.8 KB Created: 2021-03-13 17:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcff359e80d07d0f2fd0ffed9e962edf SHA-1: 5bb54dd5adc61424a9ffa9eaa0ec9ecaacdbc4a6 SHA-256: 884475cc68101cebe9e2e90731dad09a22d4039f0bf95dd789e4ab17641e41ee
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as academic resources, indicating a link farm or phishing lure. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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
  • 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://jacksth.ru/award?keyword=beginning+algebra+tobey+8th+edition+pdf
    • http://dofoten.22web.org/what_are_the_advantages_of_solar_thermal_energy.pdf
    • https://zebaraxofalolal.weebly.com/uploads/1/3/0/8/130813897/xarotavobofituvavi.pdf
    • https://tenimuleletef.weebly.com/uploads/1/3/4/3/134343202/2faee83c3.pdf
    • http://kebawabo.22web.org/control_variable_in_research.pdf
    • https://cdn-cms.f-static.net/uploads/4417137/normal_5fd0e9fdc2a5b.pdf
    • https://static.s123-cdn-static.com/uploads/4426971/normal_5fee7e9729c84.pdf
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/225330e43b634.pdf
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/9896636.pdf
    • https://kilobabax.weebly.com/uploads/1/3/1/8/131856311/vunipudiwane_weniw_towew.pdf
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/5379622.pdf
    • https://javexediwoxi.weebly.com/uploads/1/3/4/5/134584379/tibifexi.pdf
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/pifuvo.pdf
    • http://dubulus.iblogger.org/mapave.pdf
    • https://static.s123-cdn-static.com/uploads/4493198/normal_5fe2a8ca51d0c.pdf
    • https://lagisarer.weebly.com/uploads/1/3/4/1/134131240/8483424.pdf
    • https://valutakawewa.weebly.com/uploads/1/3/1/3/131378791/jiwewimifu.pdf
    • https://tafujopebipa.weebly.com/uploads/1/3/0/7/130774972/xorilanugu-fovevuz-janewugujo.pdf
    • http://nitalesilafatem.22web.org/maplestory_reboot_equipment_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4383295/normal_603593c24ebc2.pdf
    • https://kolukofutire.weebly.com/uploads/1/3/0/7/130740340/9330197.pdf
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/vulipupapijilun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lekinip.epizy.com/sinopemasizagixitafakidoj.pdf
    • http://fobexegedun.epizy.com/xonogomo.pdf
    • http://mevidow.epizy.com/ti_84_plus_ce_emulator_android.pdf
    • http://nazifaba.rf.gd/52762001567.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_off00012350.bin
aa41f38265d6dc66c65f6aba5be395029e6514045fececb3e9ce7ac9e97f0e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 5608 bytes
font_01_sfnt_off00013663.bin
59c8a0120870821b58445b4f2bed165c7d25f210afbca718814a792f170c8d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13663 11740 bytes

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