Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1ff1396fb8562e…

MALICIOUS

PDF

90.1 KB Created: 2021-03-25 14:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 94090846dc62f74bf7bd14c50f02b7ef SHA-1: 34466285e0253ea74e6b0ec88b7a53dece2e62e9 SHA-256: 8f1ff1396fb8562edaaf08e7d6c69a332c424043437766839913a70930b71e9d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed to phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/strik?utm_term=what+lancets+go+with+accu+chek+nano+meter In PDF document text
    • https://suwuvonujijipi.weebly.com/uploads/1/3/4/0/134042364/2be52836d.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/how_do_i_turn_up_my_vizio_tv_without_a_remote.pdfIn PDF document text
    • http://sadugumipid.iblogger.org/lomozisagepotijadowovuwiw.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/40517057843.pdfIn PDF document text
    • https://nagajaburelu.weebly.com/uploads/1/3/2/7/132740350/748ec.pdfIn PDF document text
    • http://gikepofazanapol.mypressonline.com/wokapufoxawika.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/a52a6ac3cc.pdfIn PDF document text
    • http://penaxuwilamufo.iblogger.org/speaker_of_test_failed_android.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/796901118.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/iia8jbH/ponuguxegafefopefugegi.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/8174297.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/rja6gg7/64480820653.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/jfhcjco/94340274672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_850397675c054ce5a679c39fad420c31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goneduzum/historia_del_arroz_con_leche_peruano.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_06ab2636b8b44e94b98c2da2510655c6.pdf?index=trueIn PDF document text
    • http://bejitepirisobi.epizy.com/60389319725.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/mogibaxanurijo.pdfIn PDF document text
    • http://joveteki.epizy.com/42922204995.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/fire_emblem_conquest_guide_reddit.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_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 5384 bytes
SHA-256: a0402ceab432d2a937028048f68e7954fc941d179641c182b34d3bad09f68163
font_01_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 11500 bytes
SHA-256: fae715a8ba9d266d86a0e045e722853b88f993076cf5404f65fa4dc70d3f8de5
font_02_sfnt_off000145ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AD 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953